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• WiFi on Ubuntu 12.04 custom: downloading unbearably slow

  - by Mark

  iwconfig reports 11 Mbps, yet I've seen as low as <1 KBps. This is the latest in my laundry list of Ubuntu problems in a dual-boot machine (cyberpowerpc custom, intel i7-3820, nvidia gtx 570). I received it two days ago, Windows 7 running fine, still having problems with Ubuntu. The browsing is intermittent but unacceptable. e.g. I could get to this site last night but I couldn't post this question. The downloading is unbearably slow, I can't download anything or install any packages because the speed is so slow. e.g. I am trying to install vim which is inexplicably missing from my 12.04 install (add another one to the problems list) and my download speed reported in the terminal was 241 B/s. Yes, bytes. iwconfig reports 11 Mbps, which further adds to the confusion. User@ubuntu:~$ iwconfig lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:"linksys" Mode:Managed Frequency:2.437 GHz Access Point: 00:18:39:76:2C:A1 Bit Rate=11 Mb/s Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=36/70 Signal level=-74 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:54 Invalid misc:18 Missed beacon:0 eth0 no wireless extensions. Any ideas? I see this is a problem a lot of people, but none of the on line solutions have worked for me so far. e.g. one site recommends editing the ath9k.conf file in /etc/modprobe.d, yet this file isn't even in the folder: User@ubuntu:/$ cd etc/modprobe.d User@ubuntu:/etc/modprobe.d$ ls alsa-base.conf blacklist-oss.conf blacklist-ath_pci.conf blacklist-rare-network.conf blacklist.conf blacklist-watchdog.conf blacklist-firewire.conf dkms.conf blacklist-framebuffer.conf nvidia-current_hybrid.conf blacklist-modem.conf nvidia-graphics-drivers.conf I think the nvidia gpu might be mucking things up. I had the "blinking cursor" problem when installing in the first place, and then I had the monitor out of range problem as well. I have my faithful Asus laptop, which is running Ubuntu 12.04 just fine. The only difference is executing host -t SOA local in the terminal gives User@ubuntu:~$ host -t SOA local local has SOA record local. nobody.localhost. 42 86400 43200 604800 10800 in my new machine, and the command reports Host local. not found in the laptop. Help would be most welcome, as I am in danger of reverting back to Windows. I'm seriously considering it. Sorry for the length, trying to show my effort in resolving the issue and include terminal snippets that might be helpful.

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• why there is a lot change in the hardware support features in different linux os?

  - by TrazerWalker

  i am using lenovo b460 with 3 GB ram and 500 GB hard disk,(no graphics card). when i live boot Linux mint i was able to connect to WiFi.but when i booted up Ubuntu 11.4 i was not able to connect through WiFi.then later i installed Ubuntu 12.4 and then i got connected with WiFi, but after installing icons and themes through my unity i am not able to view the content in the terminal and the WiFi is also not connecting now even after i changed them all back. wireless connectivity

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• Problem retrieving Strings from varbinary columns using HIbernate and MySQL

  - by user303396

  Hello, Here's my scenario. I save a bunch of Strings containing asian characters in MySQL using Hibernate. These strings are written in varbinary columns. Everything works fine during the saving operation. The DB contains the correct values (sequence of bytes). If I query (again using Hibernate) for the Strings that I saved I get the correct results. But when Hibernate fills the entity to which the Strings belong with the values from the DB I get different values then the ones I used in the query that retrieved them. Instead of receiving the correct values I receive a bunch of FFFD replacement characters. For example: if I store "??" in the DB and then I query for it, the resulting String will be \uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD. the DB connection has the following parameters set useUnicode=true&characterEncoding=UTF-8, I've tried using the true UTF-8 configurations for Hibernate but that didn't solve the problem What am I missing? Any suggestions? Thanks

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• How to easily map c++ enums to strings

  - by Roddy

  I have a bunch of enum types in some library header files that I'm using, and I want to have a way of converting enum values to user strings - and vice-versa. RTTI won't do it for me, because the 'user strings' need to be a bit more readable than the enumerations. A brute force solution would be a bunch of functions like this, but I feel that's a bit too C-like. enum MyEnum {VAL1, VAL2,VAL3}; String getStringFromEnum(MyEnum e) { switch e { case VAL1: return "Value 1"; case VAL2: return "Value 2"; case VAL1: return "Value 3"; default: throw Exception("Bad MyEnum"); } } I have a gut feeling that there's an elegant solution using templates, but I can't quite get my head round it yet. UPDATE: Thanks for suggestions - I should have made clear that the enums are defined in a third-party library header, so I don't want to have to change the definition of them. My gut feeling now is to avoid templates and do something like this: char * MyGetValue(int v, char *tmp); // implementation is trivial #define ENUM_MAP(type, strings) char * getStringValue(const type &T) \ { \ return MyGetValue((int)T, strings); \ } ; enum eee {AA,BB,CC}; - exists in library header file ; enum fff {DD,GG,HH}; ENUM_MAP(eee,"AA|BB|CC") ENUM_MAP(fff,"DD|GG|HH") // To use... eee e; fff f; std::cout<< getStringValue(e); std::cout<< getStringValue(f);

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• TCP connection lost problems in c#

  - by alex

  Hi: In my application, I have a server listening on a port on localhost for client connection. Then I have clients running and establishes connection with the server. I used tcpListner in c# for the server and the clients were written in perl using Inet function. The connection between clients and server were established without a problem and a message from client is received by the server. However, after about 3 to 4 seconds, the connection is lost. I use netstat -a to see if the status of the connection is still "established". The result is "Close_wait" after I use netstat command on DOS. How can I debug this problem? Which side is causing the lost of connection? Thanks

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• SSH connection times out

  - by mark

  Given: vm - a WinXPsp3 virtual machine hosted by a Win7sp1 physical machine alice is the user on vm srv - a Win2008R2sp1 server bob is the user on srv quake - a linux server mark is the user on quake Both vm and srv have the same new installation of cygwin (1.7.9) and openssh. Firewall service is disabled on vm (and its host) and on srv All the machines can be pinged from all the machines. ssh mark@quake works OK from both vm and srv. ssh bob@srv works OK from both quake and vm. ssh alice@vm works on the vm itself only, but it fails on the other two machines: alice@vm ~ $ ssh alice@vm alice@vm's password: Last login: Tue Oct 25 23:42:09 2011 from vm.shunra.net [mark@Quake ~]$ ssh -vvv alice@vm OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to vm [172.30.2.60] port 22. debug1: connect to address 172.30.2.60 port 22: Connection timed out ssh: connect to host vm port 22: Connection timed out bob@Srv ~ $ ssh -vvv alice@vm OpenSSH_5.9p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug2: ssh_connect: needpriv 0 debug1: Connecting to vm [172.30.2.60] port 22. debug1: connect to address 172.30.2.60 port 22: Connection timed out ssh: connect to host vm port 22: Connection timed out I used ssh-host-config both on vm and srv to configure the ssh to run as a windows service. Besides that I did nothing else. Can anyone help me troubleshoot this issue? Thank you very much. EDIT The virtual machine software is VMWare Workstation 7.1.4. I think the problem is in its settings, but I have no idea where exactly. The Network Adapter is set to Bridged. EDIT2 All the machines are located in the company lab, I think all of them are on the same segment, but I may be wrong. Below is the ipconfig /all output for each machine (skipping the linux server). I have deleted the Tunnel adapters to keep the output minimal. If anyone thinks they matter, do tell so and I will post them as well. In addition ping output is given to show that DNS is correct. Something else, may be relevant, may be not. Doing psexec to srv works OK, whereas to vm failes with Access Denied. srv: C:\Windows\system32>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : srv Primary Dns Suffix . . . . . . . : shunra.net Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : shunra.net Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Broadcom BCM5709C NetXtreme II GigE (NDIS VBD Client) Physical Address. . . . . . . . . : E4-1F-13-6D-F3-00 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv4 Address. . . . . . . . . . . : 172.30.6.9(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.248.0 Default Gateway . . . . . . . . . : 172.30.0.254 DNS Servers . . . . . . . . . . . : 172.30.1.1 172.30.1.2 NetBIOS over Tcpip. . . . . . . . : Enabled C:\Windows\system32>ping vm Pinging vm.shunra.net [172.30.2.60] with 32 bytes of data: Reply from 172.30.2.60: bytes=32 time=1ms TTL=128 Reply from 172.30.2.60: bytes=32 time=4ms TTL=128 Reply from 172.30.2.60: bytes=32 time<1ms TTL=128 Reply from 172.30.2.60: bytes=32 time<1ms TTL=128 Ping statistics for 172.30.2.60: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 4ms, Average = 1ms C:\Windows\system32> vm: C:\>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : vm Primary Dns Suffix . . . . . . . : shunra.net Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : shunra.net shunranet Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : shunranet Description . . . . . . . . . . . : VMware Accelerated AMD PCNet Adapter Physical Address. . . . . . . . . : 00-0C-29-8F-A0-0B Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 172.30.2.60 Subnet Mask . . . . . . . . . . . : 255.255.248.0 Default Gateway . . . . . . . . . : 172.30.0.254 DHCP Server . . . . . . . . . . . : 172.30.1.1 DNS Servers . . . . . . . . . . . : 172.30.1.1 172.30.1.2 Lease Obtained. . . . . . . . . . : Tuesday, October 25, 2011 18:16:34 Lease Expires . . . . . . . . . . : Wednesday, November 02, 2011 18:16:34 C:\>ping srv Pinging srv.shunra.net [172.30.6.9] with 32 bytes of data: Reply from 172.30.6.9: bytes=32 time=1ms TTL=128 Reply from 172.30.6.9: bytes=32 time<1ms TTL=128 Reply from 172.30.6.9: bytes=32 time<1ms TTL=128 Reply from 172.30.6.9: bytes=32 time<1ms TTL=128 Ping statistics for 172.30.6.9: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 1ms, Average = 0ms C:\> vm-host (the host machine of the vm): C:\>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : vm-host Primary Dns Suffix . . . . . . . : shunra.net Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : shunra.net Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Realtek RTL8168D/8111D Family PCI-E Gigabit Ethernet NIC (NDIS 6.20) Physical Address. . . . . . . . . : 6C-F0-49-E7-E9-30 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::f59d:7f6e:1510:6f%10(Preferred) IPv4 Address. . . . . . . . . . . : 172.30.6.7(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.248.0 Default Gateway . . . . . . . . . : 172.30.0.254 DHCPv6 IAID . . . . . . . . . . . : 242020425 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-CC-39-80-6C-F0-49-E7-E9-30 DNS Servers . . . . . . . . . . . : 172.30.1.1 194.90.1.5 NetBIOS over Tcpip. . . . . . . . : Enabled Ethernet adapter VMware Network Adapter VMnet1: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : VMware Virtual Ethernet Adapter for VMnet1 Physical Address. . . . . . . . . : 00-50-56-C0-00-01 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::cd92:38c0:9a6d:c008%16(Preferred) Autoconfiguration IPv4 Address. . : 169.254.192.8(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : DHCPv6 IAID . . . . . . . . . . . : 352342102 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-CC-39-80-6C-F0-49-E7-E9-30 DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1 fec0:0:0:ffff::2%1 fec0:0:0:ffff::3%1 NetBIOS over Tcpip. . . . . . . . : Enabled Ethernet adapter VMware Network Adapter VMnet8: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : VMware Virtual Ethernet Adapter for VMnet8 Physical Address. . . . . . . . . : 00-50-56-C0-00-08 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::edb9:b78c:a504:593b%17(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.5.1(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : DHCPv6 IAID . . . . . . . . . . . : 369119318 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-CC-39-80-6C-F0-49-E7-E9-30 DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1 fec0:0:0:ffff::2%1 fec0:0:0:ffff::3%1 NetBIOS over Tcpip. . . . . . . . : Enabled C:\>ping srv Pinging srv.shunra.net [172.30.6.9] with 32 bytes of data: Reply from 172.30.6.9: bytes=32 time<1ms TTL=128 Reply from 172.30.6.9: bytes=32 time<1ms TTL=128 Reply from 172.30.6.9: bytes=32 time<1ms TTL=128 Reply from 172.30.6.9: bytes=32 time<1ms TTL=128 Ping statistics for 172.30.6.9: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms C:\>ping vm Pinging vm.shunra.net [172.30.2.60] with 32 bytes of data: Reply from 172.30.2.60: bytes=32 time<1ms TTL=128 Reply from 172.30.2.60: bytes=32 time<1ms TTL=128 Reply from 172.30.2.60: bytes=32 time<1ms TTL=128 Reply from 172.30.2.60: bytes=32 time<1ms TTL=128 Ping statistics for 172.30.2.60: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms C:\> EDIT3 I have just checked - the vm-host is able to ssh to the vm machine! I still do not know how to leverage this discovery to solve the problem.

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• How to tell if a datareader is open on a connection and close it

  - by Earlz

  Hi, I'm setting up a little thing for connection pooling and on of the more common bugs that we have occur(its always an easy fix, but we just can't remember reader.Close()!) it is when we have a connection that is used by a lot of classes/methods and one method opens a data reader and forgets to close it. This isn't really bad cause a lot of times all you have to do is go into the debugger and go up one level and see the function before it was and check if it had an unclosed data reader. Now, here is the bigger problem. In this connection pool, if a datareader is open, then it's not known until a thread gets a connection and tries to use it and the thing that originally opened the data reader may no longer even be alive. So quite simply, how can you detect if a data reader is open on a connection and is there a way to close the reader without closing the connection?

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• When should I open and close a connection to SQL Server

  - by Martin

  I have a simple static class with a few methods in it. Each of those methods open a SqlConnection, query the database and close the connection. This way, I am sure that I always close the connection to the database, but on the other hand, I don't like to always open and close connection. Below is an example of what my methods look like. public static void AddSomething(string something) { using (SqlConnection connection = new SqlConnection("...")) { connection.Open(); // ... connection.Close(); } } Considering that the methods are inside a static class, should I have a static member containing a single SqlConnection? How and when should I drop it? What are the best practices?

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• Should I catch exceptions thrown when closing java.sql.Connection

  - by jb

  Connection.close() may throw SqlException, but I have always assumed that it is safe to ignore any such exceptions (and I have never seen code that does not ignore them). Normally I would write: try{ connection.close(); }catch(Exception e) {} Or try{ connection.close(); }catch(Exception e) { logger.log(e.getMessage(), e); } The question is: Is it bad practice (and has anyone had problems when ignoring such exeptions). When Connection.close() does throw any exception. If it is bad how should I handle the exception. Comment: I know that discarding exceptions is evil, but I'm reffering only to exceptions thrown when closing a connection (and as I've seen this is fairly common in this case). Does anyone know when Connection.close() may throw anything?

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• Connection Timeout Extension/Detection

  - by ircmaxell

  Well, let me start off by explaining what I'm trying to do. I have an application that stalls a HTTP connection until new data is available (sometimes a few seconds, sometimes 30 minutes or so). Right now, the system works fine if the data is sent within a few minutes. The problem I'm facing, is that it doesn't seem that XHR recognizes a dropped connection... So instead of killing the current connection and reconnecting when it detects a dropped connection, it just sits there. I'd really not like to have it force-reconnect every minute or two (That's one reason this app was written, to stop the need for polling). So, my questions are as follows: Is there a way to detect a dropped (not closed) TCP connection with XHR? Is there a way that I can tell XHR not to timeout (I saw IE8 has the .timeout property) Would it be better to send a header (or some other content) every now and then (say once per minute) down the pipe to keep the connection open? Thanks.

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• Best Practice to write Connection string for heavy traffic ASP.NET Web Application

  - by hungrycoder

  What is the best way to define connection string for a web application that has minimum 500 live users on the internet in terms of connection pooling. And load factors to consider? Suppose I have connection string as follows: initial catalog=Northwind; Min Pool Size=20;Max Pool Size=500; data source=localhost; Connection Timeout=30; Integrated security=sspi" as Max Pool Size is 500 and as live users exceed 500 say 520 will the remaining 20 users experience slower page load?? Or what if I have connection string as follows which doesn't talks anything about pooling or Connection time out? How the application behaves then? initial catalog=Northwind; data source=localhost; Integrated security=sspi" I'm using "Using statements" however to access the MYSQL database.

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• Error with connection in my database servlet

  - by Zerobu

  Hello, I am writing a Database servlet, all seems well except that there seems to be an error in my connection import java.io.IOException; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import javax.servlet.RequestDispatcher; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class DBServlet3 extends HttpServlet { private static final long serialVersionUID = 1L; @Override public void init() throws ServletException { super.init(); try { String jdbcDriverClass= getServletContext().getInitParameter( "jdbcDriverClass" ); if (jdbcDriverClass == null) throw new ServletException( "Could not find jdbcDriverClass initialization parameter" ); Class.forName( jdbcDriverClass ); } catch (ClassNotFoundException e) { throw new ServletException( "Could not load JDBC driver class", e ); } } @Override protected void doGet( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { RequestDispatcher dispatcher= request.getRequestDispatcher( "/db.jsp" ); ServletContext application= getServletContext(); ArrayList<String> names= new ArrayList<String>(); try { Connection connection= null; Statement statement= null; ResultSet results= null; try { String jdbcUrl= application.getInitParameter( "jdbcUrl" ); String jdbcUser= application.getInitParameter( "jdbcUser" ); String jdbcPassword= application.getInitParameter( "jdbcPassword" ); connection= DriverManager.getConnection( jdbcUrl, jdbcUser, jdbcPassword ); statement= connection.createStatement(); results= statement.executeQuery( "SELECT * FROM students" ); while (results.next()) { String name= results.getString( "name" ); names.add( name ); } } finally { if (results != null) results.close(); if (statement != null) statement.close(); if (connection != null) connection.close(); } } catch (SQLException e) { throw new ServletException( e ); } request.setAttribute( "names", names ); dispatcher.forward( request, response ); } @Override protected void doPost( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { String sql= "INSERT INTO students VALUES (" + request.getParameter( "id" ) + ", '" + request.getParameter( "name" ) + "')"; sql= "INSERT INTO students VALUES (?, ?, ?, ?)"; PreparedStatement statement= connection.prepareStatement( sql ); //error on this line statement.setString( 1, request.getParameter( "id" ) ); statement.setString( 2, request.getParameter( "name" ) ); } }

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• Postfix Send Error: Must Issue STARTTLS command

  - by Mary Elizabeth

  Running Ubuntu 12.04 and trying to configure postfix to relay send and receive through GMAIL. Am running into connection issues particularly with TLS. Have tried a bunch of troubleshooting solutions and have changed my main.cf to address TLS but still receive the below errors. Tried debugging connection issues with: `root@mailservice:/etc/postfix# openssl s_client -connect localhost:587 -starttls smtp` and I recveive these errors `connect: Connection refused' 'connect:errno=111` in my logs I see: Jun 11 13:54:31 mailservice postfix/smtp[3765]: warning: cannot get RSA certificate from file /etc/postfix/cert.pem: disabling TLS support Jun 11 13:54:31 mailservice postfix/smtp[3765]: warning: TLS library problem: 3765:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:696:Expecting: TRUSTED CERTIFICATE: Jun 11 13:54:31 mailservice postfix/smtp[3765]: warning: TLS library problem: 3765:error:140DC009:SSL routines:SSL_CTX_use_certificate_chain_file:PEM lib:ssl_rsa.c:729: Jun 11 13:54:31 mailservice postfix/smtp[3765]: 9986B6846A: to= <[email protected]>, relay=smtp.gmail.com[173.194.77.109]:587, delay=0.15, delays=0.02/0.02/0.09/0.02, dsn=5.7.0, status=bounced (host smtp.gmail.com[173.194.77.109] said: 530 5.7.0 Must issue a STARTTLS command first. hd9sm12170509obc.6 (in reply to MAIL FROM command)) The contents of my main.cf (pertaining to TLS) look like this: #TLS Parameters smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache #TLS Settings smtp_use_tls = yes smtp_tls_security_level = may smtp_tls_loglevel = 1 smtp_enforce_tls = yes smtp_tls_CAfile = /etc/postfix/cacert.pem smtp_tls_cert_file = /etc/postfix/cert.pem smtp_tls_key_file = $smtp_tls_cert_file smtp_tls_session_cache_dataabase = btree:/var/run/smtp_tls_session_cache smtp_tls_note_starttls_offer = yes smtpd_use_tls = yes smtpd_tls_security)level = may smtpd_tls_auth_only = no smtpd_tls_CAfile = /etc/postfix/cacert.pem smtpd_tls_cert_file = /etc/postfix/cert.pem smtpd_tls_key_file = /etc/postfix/key.pem smtpd_tls_received_header = yes smtpd_tls_session_cache_database = btree:/var/run/smtpd_tls_session_cache smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom As far as I can tell everything is in order for a proper TLS Connection, and I am unsure what would need to change in main.cf or elsewhere for mail to send.

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• Unable to connect to APNS with java-apns

  - by Mac

  I've got a Java program running on a firewalled server that is intended to send push notifications to my iPhone app by using java-apns. Problem is, whenever I try to send a notification the library fails to connect to the APNS server. From the stack trace, it seems that when creating the required SSL connection, the connection is being refused at some point (a java.net.ConnectException with a detail message of "connection refused" is being thrown when the library calls SSLSocketFactory's createSocket method). It would not surprise me at all if the firewall is blocking the connection, but unfortunately as I do not manage the server I am unable to verify that that is indeed the case. The fact that the program works fine from my (non-firewalled) desktop seems to support the theory. My question is, does anyone know of any method by which I can find the root cause of the problem, and/or can anyone tell me what I should tell the server admin to change to get things to work (if it is indeed the firewall that's the problem)? For reference, the server is a Linux box and I'm using version 0.1.2 of java-apns.

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• SQL Server 2008 login problem with ASP.NET application: Failed to open the explicitly specified data

  - by eulerfx

  I am running SQL Server 2008 Express Edition on Windows Server 2008 with an ASP.NET application which must access the server. The ASP.NET application is associated with an application pool that runs on the NetworkService account. This account in turn has a Login and User record on SQL Server in the required database. When I attempt to run the ASP.NET website I get a blank page and when viewed in the error log, I seem to be getting this information event record: Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. Reason: Failed to open the explicitly specified database. [CLIENT: myLocalMachine] The connection string has Trusted_Connection=True; and the required database specified. When I explicitly specify the user name and password I get another login error stating the password is incorrect, even though the same un/pw combination works through SQL Server Management studio. The NETWORK SERVICE account seems to have all the required privileges for the database. Also, I made a test ASP.NET website project which does a simple select from a table in that database, and using the same config file I am not getting the error and it seems to work. Is it something to do with trust levels then, because the original ASP.NET web app references various DLLs including open source libraries. Also, the application does not seem to be able to write to the event log itself, throwing a security exception, even though everything in the config files, including machine.config states the app is in full trust.

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• Can I make TCP/IP session to run less than 60 seconds?

  - by par

  Our server is overloaded with TCP/IP sessions, we have 1200 - 1500 of them. Most of them are hanging in TIME_OUT state. It turns out that a connection in TIME_OUT state occupies a socket until 60 second time-out is elapsed. The problem is that the server gets unresponsive and many clients are not getting served. I have made a simple test: download an XML file from the server with Internet Explorer 8.0 The download finishes in a fraction of second. But then I see that the TCP/IP connection is hanging in TIME_OUT state for 60 seconds. Is there any way to get rid of TIME_OUT waiting or make it less to free the socket for new connections? I understand why TCP/IP connection enters TIME_OUT state, but I don't understand why Internet Explorer does not close the connection after the XML file download is over. The details. Our server runs web service written in Perl (mod-perl). The service provides weather data to clients. Client is a Flash appication (actually Flash ActiveX control embedded in Windows application). OS: Ubuntu Apache "Keep Alive" option is set to 0

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• Seemingly random network connectivity.

  - by AngryHacker

  This has been driving me nuts for a while. When I turn on the PC (which has a wired Ethernet connection), it cannot be accessed by other computers on the network. In other words, inbound connections do not work. The firewall is disabled. The PC itself can hit up anything it wants just fine. By process of elimination, I've figured out that checking or unchecking the Eaclift driver in the properties for my network connection restored the inbound connection. I do not know what Eaclift driver is or does or how it even got on my PC (e.g. I am not allowed to uninstall it either). And it does not matter whether it's on or off - I just need to toggle it to restore connectivity. One other thing that happens when I toggle the Eaclift driver, is than an Internet Connection icon appears in the Network Connections and it was not there before. Can someone shed some light as to what is going on? How to fix it so that I don't have to deal with this insanity?

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• SQL Server 2008 login problem with ASP.NET application: Failed to open the explicitly specified database

  - by eulerfx

  I am running SQL Server 2008 Express Edition on Windows Server 2008 with an ASP.NET application which must access the server. The ASP.NET application is associated with an application pool that runs on the NetworkService account. This account in turn has a Login and User record on SQL Server in the required database. When I attempt to run the ASP.NET website I get a blank page and when viewed in the error log, I seem to be getting this information event record: Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. Reason: Failed to open the explicitly specified database. [CLIENT: myLocalMachine] The connection string has Trusted_Connection=True; and the required database specified. When I explicitly specify the user name and password I get another login error stating the password is incorrect, even though the same un/pw combination works through SQL Server Management studio. The NETWORK SERVICE account seems to have all the required privileges for the database. Also, I made a test ASP.NET website project which does a simple select from a table in that database, and using the same config file I am not getting the error and it seems to work. Is it something to do with trust levels then, because the original ASP.NET web app references various DLLs including open source libraries. Also, the application does not seem to be able to write to the event log itself, throwing a security exception, even though everything in the config files, including machine.config states the app is in full trust.

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• Trouble connecting to a local SQL server instance from the web

  - by dfarney

  We have a small network behind a firewall (WatchGuard XTM 2 series) and network switch. On our network we have multiple instances of SQL server, but 1 in specific that I would like to be able to access remotely from our website. We have a static IP address from our ISP and then all the machines on the network have a locally assigned dynamic IP address. When trying to connect to the database from outside our network how do I get the request to be directed to the proper machine / SQL instance? Is it a parameter in my connection string or something in my firewall? A few things to rule out: 1) The firewall is allowing access from the website to our network. I added the site's IP and opened up port 1433. Also, when trying to connect and monitoring the firewall no exceptions come up as they did before I added the proper IP address. 2) Remote connections on the SQL server has been setup and enabled. I've done a lot of reading up on remote connections and I am sure it has been setup properly. I am currently getting this error message on my site: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.)

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• Setup routing and iptables for new VPN connection to redirect **only** ports 80 and 443

  - by Steve

  I have a new VPN connection (using openvpn) to allow me to route around some ISP restrictions. Whilst it is working fine, it is taking all the traffic over the vpn. This is causing me issues for downloading (my internet connection is a lot faster than the vpn allows), and for remote access. I run an ssh server, and have a daemon running that allows me to schdule downloads via my phone. I have my existing ethernet connection on eth0, and the new VPN connection on tun0. I believe I need to setup the default route to use my existing eth0 connection on the 192.168.0.0/24 network, and set the default gateway to 192.168.0.1 (my knowledge is shaky as I haven't done this for a number of years). If that is correct, then I'm not exactly sure how to do it!. My current routing table is: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface MSS Window irtt 0.0.0.0 10.51.0.169 0.0.0.0 UG 0 0 0 tun0 0 0 0 10.51.0.1 10.51.0.169 255.255.255.255 UGH 0 0 0 tun0 0 0 0 10.51.0.169 0.0.0.0 255.255.255.255 UH 0 0 0 tun0 0 0 0 85.25.147.49 192.168.0.1 255.255.255.255 UGH 0 0 0 eth0 0 0 0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0 0 0 0 192.168.0.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0 0 0 0 After fixing the routing, I believe I need to use iptables to configure prerouting or masquerading to force everything for destination port 80 or 443 over tun0. Again, I'm not exactly sure how to do this! Everything I've found on the internet is trying to do something far more complicated, and trying to sort the wood from the trees is proving difficult. Any help would be much appreciated. UPDATE So far, from the various sources, I've cobbled together the following: #!/bin/sh DEV1=eth0 IP1=`ifconfig|perl -nE'/dr:(\S+)/&&say$1'|grep 192.` GW1=192.168.0.1 TABLE1=internet TABLE2=vpn DEV2=tun0 IP2=`ifconfig|perl -nE'/dr:(\S+)/&&say$1'|grep 10.` GW2=`route -n | grep 'UG[ \t]' | awk '{print $2}'` ip route flush table $TABLE1 ip route flush table $TABLE2 ip route show table main | grep -Ev ^default | while read ROUTE ; do ip route add table $TABLE1 $ROUTE ip route add table $TABLE2 $ROUTE done ip route add table $TABLE1 $GW1 dev $DEV1 src $IP1 ip route add table $TABLE2 $GW2 dev $DEV2 src $IP2 ip route add table $TABLE1 default via $GW1 ip route add table $TABLE2 default via $GW2 echo "1" > /proc/sys/net/ipv4/ip_forward echo "1" > /proc/sys/net/ipv4/ip_dynaddr ip rule add from $IP1 lookup $TABLE1 ip rule add from $IP2 lookup $TABLE2 ip rule add fwmark 1 lookup $TABLE1 ip rule add fwmark 2 lookup $TABLE2 iptables -t nat -A POSTROUTING -o $DEV1 -j SNAT --to-source $IP1 iptables -t nat -A POSTROUTING -o $DEV2 -j SNAT --to-source $IP2 iptables -t nat -A PREROUTING -m state --state ESTABLISHED,RELATED -j CONNMARK --restore-mark iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j CONNMARK --restore-mark iptables -t nat -A PREROUTING -i $DEV1 -m state --state NEW -j CONNMARK --set-mark 1 iptables -t nat -A PREROUTING -i $DEV2 -m state --state NEW -j CONNMARK --set-mark 2 iptables -t nat -A PREROUTING -m connmark --mark 1 -j MARK --set-mark 1 iptables -t nat -A PREROUTING -m connmark --mark 2 -j MARK --set-mark 2 iptables -t nat -A PREROUTING -m state --state NEW -m connmark ! --mark 0 -j CONNMARK --save-mark iptables -t mangle -A PREROUTING -i $DEV2 -m state --state NEW -p tcp --dport 80 -j CONNMARK --set-mark 2 iptables -t mangle -A PREROUTING -i $DEV2 -m state --state NEW -p tcp --dport 443 -j CONNMARK --set-mark 2 route del default route add default gw 192.168.0.1 eth0 Now this seems to be working. Except it isn't! Connections to the blocked websites are going through, connections not on ports 80 and 443 are using the non-VPN connection. However port 80 and 443 connections that aren't to the blocked websites are using the non-VPN connection too! As the general goal has been reached, I'm relatively happy, but it would be nice to know why it isn't working exactly right. Any ideas? For reference, I now have 3 routing tables, main, internet, and vpn. The listing of them is as follows... Main: default via 192.168.0.1 dev eth0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1 Internet: default via 192.168.0.1 dev eth0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1 192.168.0.1 dev eth0 scope link src 192.168.0.73 VPN: default via 10.38.0.205 dev tun0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1

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• Algorithm for disordered sequences of strings

  - by Kinopiko

  The Levenshtein distance gives us a way to calculate the distance between two similar strings in terms of disordered individual characters: quick brown fox quikc brown fax The Levenshtein distance = 3. What is a similar algorithm for the distance between two strings with similar subsequences? For example, in quickbrownfox brownquickfox the Levenshtein distance is 10, but this takes no account of the fact that the strings have two similar subsequences, which makes them more "similar" than completely disordered words like quickbrownfox qburiocwknfox and yet the completely disordered version has a Levenshtein distance of eight. What distance measures exist which take the length of subsequences into account, without assuming that the subsequences can be easily broken into distinct words?

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• Algorithm for measuring distance between disordered sequences of strings

  - by Kinopiko

  The Levenshtein distance gives us a way to calculate the distance between two similar strings in terms of disordered individual characters: quick brown fox quikc brown fax The Levenshtein distance = 3. What is a similar algorithm for the distance between two strings with similar subsequences? For example, in quickbrownfox brownquickfox the Levenshtein distance is 10, but this takes no account of the fact that the strings have two similar subsequences, which makes them more "similar" than completely disordered words like quickbrownfox qburiocwknfox and yet this completely disordered version has a Levenshtein distance of eight. What distance measures exist which take the length of subsequences into account, without assuming that the subsequences can be easily broken into distinct words?

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• manipulating strings, search text

  - by alhambraeidos

  Hi all, I try explain my issue: note 1: I have only strings, not files, ONLY strings. I have a string like this (NOTE: I include line numbers for better explain) The line separator is \r\n (CRLF) string allText = 1 Lorem ipsum Lorem ipsum 2 == START 001partXXX.sql == 3 Lorem ipsum TEXT Lorem ipsum 4 == END 001partXXX.sql == 5 Lorem ipsum TEXT Lorem ipsum 6 == START 002partzzz.sql == 7 Lorem ipsum TEXT Lorem ipsum 8 == END 002partzzz.sql == I have contents strings like this: string contents1 = == START 001partXXX.sql == Lorem ipsum TEXT Lorem ipsum == END 001partXXX.sql == the other content string: string contents2 = == START 002partzzz.sql == Lorem ipsum TEXT Lorem ipsum == END 002partzzz.sql == Then, allText.IndexOf(contents1) != -1 allText.IndexOf(contents2) != -1 I need function thats receive 3 parameters: allText, Contents, and text to find in contents, and it returns the line number of Text To Find in AllText For example, input: allText, contents2, "TEXT" ouput = line number 7 Another sample, input: allText, contents1, "TEXT" ouput = line number 3 Another sample, input: allText, contents1, "TEXT NOT FOUND" ouput = line number -1 How can I implement this function ?? any help very useful for me, Thanks in advanced.

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• AutoKey - clipboard.get_selection() function fails on certain strings

  - by LonnieBest

  I've simplified my script so you can focus on the essence my problem. In AutoKey (not AutoHotKey), I made a Hot-Key (shift-alt-T) that performs this script on any string I have highlighted (like in gedit for example -- but any other gui editor too). strSelectedText = clipboard.get_selection() keyboard.send_keys(" " + strSelectedText) The script modifies the highlighted text and adds a space to the beginning of the string. It works for most strings I highlight, but not this one: * Copyright © 2008–2012 Lonnie Best. Licensed under the MIT License. It works for this string: * Add a Space 2.0.1 but not on this one: * Add a Space 2.0.1 – At the python command prompt, it has no problem any of those strings, yet the clipboard.get_selection() function seems to get corrupted by them. I'm rather new to python scripting, so I'm not sure if this is an AutoKey bug, or if I'm missing some knowledge I should know about encoding/preparing strings in python. Please help. I'm doing this on Ubuntu 12.04: sudo apt-get install autokey-qt

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• Python - converting wide-char strings from a binary file to Python unicode strings...

  - by Mikesname

  It's been a long day and I'm a bit stumped. I'm reading a binary file that contains lots of wide-char strings and I want to dump these out as Python unicode strings. (To unpack the non-string data I'm using the struct module, but I don't how to do the same with the strings.) For example, reading the word "Series": myfile = open("test.lei", "rb") myfile.seek(44) data = myfile.read(12) # data is now 'S\x00e\x00r\x00i\x00e\x00s\x00' How can I encode that raw wide-char data as a Python string? Edit: I'm using Python 2.6

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