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• cannot access my own computer through My Network Places

  - by vgv8

  My home Windows XP Pro SP3 machine is DHCP client receiving configurations from ISP. Trying to access in WindowsExplorer -My Network Places - Microsoft Windows Network shows Workgroup with a delay of 3 min and then popups messagebox: Microsoft Windows Network Workgroup is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.The list of servers for this workgroup is not currently available OK I am logged-in as local machine Administrator. The internet is accessible (I am writing this post through it) The Firewall is disabled The "Computer Bowser" and all networking services, I could find, are running Control Panel -- Network Connections -- Properties (of connection) --- Internet Protocol (TCP/IP), btn Properties --- --- tab General, btn "Advanced..." -- tab WINS-- rbtn "Enable NetBIOS over TCP/IP" checked Why cannot I access my own PC (and shares on it) through My Network Places What is the possible problem? How to daignose the problem?

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• Using both domain users and local users for Squid authentication?

  - by Massimo

  I'm working on a Squid proxy which needs to authenticate users against an Active Directory domain; this works fine, Samba was correctly set up and Squid authenticates users via ntlm_auth. Relevant lines in squid.conf: auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp auth_param ntlm children 5 auth_param ntlm keep_alive on acl Authenticated proxy_auth REQUIRED http_access allow Authenticated http_access deny all Now, I need a way to allow access to users which don't have a domain account. I know I could create an "internet user" account in the domain, but this would allow access, although limited, to domain resources (file shares, etc.); I need something that will allow only Internet access. The ideal solution would be using a local account on the proxy server, either a Linux account or a Squid one; I know Squid supports this, but I'm unable to have it use both domain authentication and Squid/local authentication if domain auth is unsuccesful. Can this be done? How?

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• vPopmail / xinetd.

  - by Lorren Biffin

  I'm attempting to setup vpopmail on my CentOS server (Media Temple). Everything is working like a charm, with the exception that I cannot login to the server from any pop3 client. Upon trying to login I get the following error: Sending of password did not succeed. Mail server mail.(mydomain).com responded: Login failed. I'm running qmail (of course) with xinetd (not tcpserver). I've placed a file called pop3 into the folder /etc/xinetd.d with the content: service pop3 { disable = no socket_type = stream protocol = tcp wait = no user = root server = /var/qmail/bin/qmail-popup server_args = mail.(mydomain).com /home/vpopmail/bin/vchkpw /var/qmail/bin/qmail-pop3d Maildir log_type = FILE /var/log/xinetd.log log_on_success = HOST log_on_failure = HOST RECORD } Can anybody offer any guidance here? I've been unsuccessfully trying to make this happen for over a week.

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• What are the main differences between SRV records and TXT records?

  - by Chris Adams

  Hi there, I'm trying to consolidate domain names for the servers I look after to just use one panel instead of 3 or 4, and one thing stopping me is that the provider I originally wanted to move them to only lets me the following kinds of records: A MX NS CNAME TXT The first four I understand, but I'm not sure about the relationship (if any) between SRV records and TXT records. Can I use TXT records in the place of SRV records? They both seem to be general text records to just point at a particular server without needing to specify a particular protocol, so it doesn't sound like a totally unreasonable assumption, but I'd rather check here before I break something. If I can only set the above records, does that mean I'm essentially unable to so any SRC record redirecting? Thanks!

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• Allow HTTPS cookies but not HTTP?

  - by Ken

  I want to allow cookies for a domain but only over HTTPS -- not cookies from the same domain that come from HTTP. For example, I don't want any http://www.google.com cookies, but I do want to allow https://www.google.com cookies (because Calendars are there). Is there a way to do this? Does the goal even make sense? In Chrome, it only allows domain names, not URLs, to be added to the cookie exception list. In Firefox, it allows a protocol, but it only records the domain name, and if you click "Allow" or "Deny", it changes the same entry in the list.

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• Difference between tcp recv buffer and tcp receive window size?

  - by pradeepchhetri

  The command shows the tcp receive buffer size in bytes. $ cat /proc/sys/net/ipv4/tcp_rmem 4096 87380 4001344 where the three values signifies the min, default and max values respectively. Then I tried to find the tcp window size using tcpdump command. $ sudo tcpdump -n -i eth0 'tcp[tcpflags] & (tcp-syn|tcp-ack) == tcp-syn and port 80 and host google.com' tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 16:15:41.465037 IP 172.16.31.141.51614 > 74.125.236.73.80: Flags [S], seq 3661804272, win 14600, options [mss 1460,sackOK,TS val 4452053 ecr 0,nop,wscale 6], length 0 I got the window size to be 14600 which is 10 times the size of MSS. Can anyone please tell me the relationship between the two.

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• Netboot Intel Macs without BSDP

  - by notpeter

  I have a netboot setup with DeployStudio that works great in my lab, but doesn't work on our main network. After some digging, I believe it's because our network admins are filtering BSDP (Boot Service Discovery Protocol) on our subnet at the switch level. Is it possible to hard code which server my clients (early 2007 iMac Core2Duos) should boot from without relying on BSDP? Perhaps relevant details: I do not have control over switch configs or DHCP settings. Client and server are running 10.6 Snow Leopard. The clients see the netboot server advertising itself in the 'Startup Disk' system preferences pane, but when I go to netboot it just leaves me with a flashing globe.

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• Parameters for selection of Operating system, memory and processor for embedded system ?

  - by James

  I am developing an embedded real time system software (in C language). I have designed the s/w architecture - we know various objects required, interactions required between various objects and IPC communication between tasks. Based on this information, i need to decide on the operating system(RTOS), microprocessor and memory size requirements. (Most likely i would be using Quadros, as it has been suggested by the client based on their prior experience in similar projects) But i am confused about which one to begin with, since choice of one could impact the selection of other. Could you also guide me on parameters to consider to estimate the memory requirements from the s/w design (lower limit and upper limit of memory requirement) ? (Cost of the component(s) could be ignored for this evaluation)

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• Sftp via shell - how it is possible

  - by Tomasz Zielinski

  (Moved from StackOverflow: http://stackoverflow.com/questions/4589725/sftp-via-shell-how-it-is-possible) How is it possible for tools like http://mysecureshell.sourceforge.net/ to provide SFTP access by merely specifying them as shell by typing: usermod -s /bin/MySecureShell myuser ? I'm on Debian Lenny, with default sshd/OpenSSH. Is this e.g. a feature of SSH protocol that allows user shell to handle sftp commands? I can't wrap my head around this because usually OpenSSH needs sftp-server module (or the internal one in newer versions) - and this makes me think that sftp commands don't even hit the shell and are handled earlier or by different code path..

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• Monit can't detect MySQL, but I can

  - by Matchu

  Monit is configured to watch MySQL on localhost at port 3306. check process mysqld with pidfile /var/lib/mysql/li175-241.pid start program = "/etc/init.d/mysql start" stop program = "/etc/init.d/mysql stop" if failed port 3306 protocol mysql then restart if 5 restarts within 5 cycles then timeout My application, which is configured to connect to MySQL via localhost:3306, is running just fine and can access the database. I can even use MySQL Query Browser to connect to the database remotely via port 3306. The port is totally open and possible to connect to. Therefore, I'm pretty darn certain that it's running. However, running monit -v reveals that Monit cannot detect MySQL on that port. 'mysqld' failed, cannot open a connection to INET[localhost:3306] via TCP This happens consistently, until Monit decides not to track MySQL anymore, as configured. How can I begin to troubleshoot this issue?

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• How to block own rpcap traffic where tshark is running?

  - by Pankaj Goyal

  Platform :- Fedora 13 32-bit machine RemoteMachine$ ./rpcapd -n ClientMachine$ tshark -w "filename" -i "any interface name" As soon as capture starts without any capture filter, thousands of packets get captured. Rpcapd binds to 2002 port by default and while establishing the connection it sends a randomly chosen port number to the client for further communication. Both client and server machines exchange tcp packets through randomly chosen ports. So, I cannot even specify the capture filter to block this rpcap related tcp traffic. Wireshark & tshark for Windows have an option "Do not capture own Rpcap Traffic" in Remote Settings in Edit Interface Dialog box. But there is no such option in tshark for linux. It will be also better if anyone can tell me how wireshark blocks rpcap traffic....

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• How can i get SSO for alfresco on windows-7 to work?

  - by Maarten

  domain AD on windows 2008 R2, linux server alfresco 3.4c, windows-7 client. I'm trying to get automatically logged into alfresco from the windows-7 client. I've looked with wireshark to see what happens: 1. Client goes to /alfresco 2. Server sends Redirect to page 3. Client goes to Redirected page 4. Server sends a WWW-Authenticate: Negotiate header 5. Client DOES NOT respond to this how can i configure the windows-7 client (or the AD domain) so that the client will in fact engage with the SPNEGO protocol? instead of just asking for user credentials? (the user is logged in through kerberos in the domain.)

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• PDAnet on Android IP on PC is not public IP. Where does the NAT take place, PDAnet or Verizon?

  - by lcbrevard

  When using PDAnet on a PC (Win7 ultimate) to USB tether a Motorola Droid on Verizon 3G the IP address of the PC appears to be public - 64.245.171.115 (64-245-171-115.pools.spcsdns.net) - but connections show as coming from another public IP - 97.14.69.212 (212-sub-97.14.69.myvzw.com). Someone is performing Network Address Translation - either PDAnet or within the Verizon 3G network. Can someone tell me who is doing the NAT? Is it PDAnet or is it at Verizon? Is there any possibility of setting up port forwarding, such that connections to the public IP 97.14.69.212 (212-sub-97.14.69.myvzw.com) are forward to the PC? We are testing a network protocol that requires either a true public IP or forwarding a range of ports from the public Internet to the system on which the software runs (actually Linux hosted by VMware Player or Workstation on a PC running Windows).

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• IIS NLB Web Farm to front Single Tomcat Instance

  - by Brent Pabst

  I've got a single Tomcat 6 server that hosts a JSP app. We just spun up a new IIS 7.5 web farm to host our other internal apps. Currently the machine that hosts Tomcat is also running IIS 7 with the ISAPI filter loaded to provide front-end handling for the JSP app. I'd like to move the IIS portion to the web farm to consolidate our IIS presence and let the Tomcat server just serve and run Java and Tomcat. Has anyone done this, is it even possible while ensuring session state is properly maintained? I had it up and running using the IIS Tomcat Connector http://tomcatiis.riaforge.org/ but after a while the communication between the boxes slowed and pages would not load. In addition it seemed like some of our authentication tickets were timing out. Thanks for any ideas or reference material!

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• How can I limit the upload/download bandwidth on my CentOS server?

  - by Dan Nestor

  How can I limit the upload and download bandwidth on my CentOS server? This is a box with a single interface, eth0. Ideally, I would like a command-line solution (I've been trying to use tc), something that I could easily switch on and off in a script. So far I've been trying to do something like tc filter add dev eth0 protocol ip prio 50 u32 police rate 100kbit burst 10240 drop but I'm obviously missing a lot of knowledge and information. Can somebody help with a quick one-liner? Many thanks, Dan

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• How to get two seperate remote domain controllers with same IP to work?

  - by Mr. Mister

  Hi, I have a VPN setup between multiple locations. Between each location and the central point (me), is a trust between our domain controllers. It all works great.. A new location wants to join, but their AD controller is using an IP address that is already in use by another AD in a separate location. Neither locations can change their IP addresses, but apparently there is a NAT rule that could be used to allow communication between each AD controller? The central site has a Cisco 5510 firewall which could perform the NAT, but I am unsure of the logic behind the NAT rule. Is anyone able to explain or help out? Thanks.

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• OpenBSD ftp-proxy behind NAT itself

  - by Manuel Faux

  Is it possible to change the PASV IP ftp-proxy of OpenBSD sends to clients, without changing the listen address of redirection control (-b <address>)? I have the following setup: FTP client --> 1:1 NAT router --> OpenBSD router --> FTP server The 1:1 NAT router has a NAT rule to forward everything to the OpenBSD router, the OpenBSD router runs the ftp-proxy -R <FTP server IP>. When the FTP client sends the PASV command, the proxy answers with the Entering Passive Mode (227) message with his own source IP on the interface to the 1:1 NAT router (obviously). Since the 1:1 NAT router is not protocol aware, it forwards this message and the client receives the message with the PASV IP of the OpenBSD router, which it does not have a route to. Is there a way, that I can tell ftp-proxy to send the Entering Passive Mode message with a different source IP?

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• Seeking webcam with own IP address

  - by Mawg

  I am not sure if this is the correct place to post, but I couldn't find anywhere better. I am looking for a webcam/movie cam and this site seems more addressed to still images, but ... I am looking for a small, rugged web-cam which can be hand-held or perhaps head-mounted (failing that I can settle for a tripod mount, but I need portability). It must have its own IP address so that anyone can view its video stream from a web browser. I would prefer 2 way voice communication too. Encryption of data is nice, as is compression (H.264). Maybe also remote control, like causing it to zoom from the browser. Does anyone have any suggestions, even suggestions of somewhere else to look? Thanks very much in advance.

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• WCF WebService: Client can't connect, as soon as request client cerficate is activated.

  - by Hinek

  I have an .NET 3.5 WCF WebService hostet in IIS 6 and using a SSL certificate. The communication between client and server works. Then I activate "request client certificate" and the client can't connect anymore Exception: System.ServiceModel.Security.SecurityNegotiationException: Could not establish secure channel for SSL/TLS with authority 'polizei-bv.stadt.hamburg.de'. Inner Exception: System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel. The certificate, the client uses is in the certificate store (local computer), the root ca is int the trusted root certification authorities store. Where can I check for an explanation on the server side? How can I check if the client really supplies it's certificate (client is not on my side)?

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• error on remote connection to mysql

  - by Ahmet vardar

  Hi, I ve been trying to connect my dedicated server mysql db from my computers localhost my code is here; $dbhost = 'domain.com'; $dbuser = 'username'; $dbpass = 'pass'; $conn = mysql_connect($dbhost, $dbuser, $dbpass) or die('Could not connect: ' . mysql_error()); $dbname = 'dbname'; mysql_select_db($dbname); I get that error Could not connect: Lost connection to MySQL server at 'reading initial communication packet', system error: 61 Dedicated server is Linux centos 64 bit, php 3.2.4, mysql 5.1.54 Is there any workaround that ? Thanks

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• Does an SMTP request contain host header information (or just the IP of the targeted SMTP server)?

  - by Olaf

  We are using an external commercial smtp server for our newsletters (sending them through .NET components), and they offer two smtp URLs - smtp.critsend.com and fast.critsend.com -, and the second one is reserved for sending singular emails, the first one for bulk. Using nslookup shows that both resolve to the same 4 IP addresses (fast.critsend.com being an Alias). Question: (how) is it possible for the smtp relay to distinguish between different names? Is there something in the headers that can be compared to host headers in http protocol (I didn't find any intelligible information for a non-sysadmins)? The reason I'm asking is because we would like to use one of the IPs in our newsletter script (which works) rather than a name (in order to save DNS requests), and we are wondering about potential problems.

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• In TCP/IP terms, how does a download speed limiter in an office work?

  - by TessellatingHeckler

  Assume an office of people, they want to limit HTTP downloads to a max of 40% bandwidth of their internet connection speed so that it doesn't block other traffic. We say "it's not supported in your firewall", and they say the inevitable line "we used to be able to do it with our Netgear/DLink/DrayTek". Thinking about it, a download is like this: HTTP GET request Server sends file data as TCP packets Client acknowledges receipt of TCP packets Repeat until download finished. The speed is determined by how fast the server sends data to you, and how fast you acknowledge it. So, to limit download speed, you have two choices: 1) Instruct the server to send data to you more slowly - and I don't think there's any protocol feature to request that in TCP or HTTP. 2) Acknowledge packets more slowly by limiting your upload speed, and also ruin your upload speed. How do devices do this limiting? Is there a standard way?

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• Network monitoring solution

  - by Hellfrost

  Hello Serverfault ! I have a big distributed system I need to monitor. Background: My system is comprised of two servers, concentrating and controlling the system. Each server is connected to a set of devices (some custom kind of RF controllers, doesnt matter to my question), each device connects to a network switch, and eventually all devices talk to the servers, the protocol between the servers and the devices is UDP, usually the packets are very small, but there are really a LOT of packets. the network is also somewhat complex, and is deployed on a large area physically. i'll have 150-300 of these devices, each generating up to 100+ packets per second, and several network switches, perhaps on 2 different subnets. Question I'm looking for some solution that will allow me to monitor all this mess, how many packets are sent, where, how do they move through the network, bandwidth utilization, throughput, stuff like that. what would you recommend to achieve this? BTW Playing nice with windows is a requirement.

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• webmail suite recommendation

  - by hoball

  Hello, I have serveral emails in a few domains (email@domain1, email@domain2, email@domain3). Currently they are on an owned email server and I am collecting emails via IMAP protocol (i would not like to use POP..) in Thunderbird. I have a few partners and I want to allow them to access the same email address. Here is what I desired: All users can open All the inboxes via IMAP @ Thunderbird (with proper configuration) at the same time, there are a webmail system, every user can login their account (userA, userB, userC), and they will see all inboxes (email@domain1, email@domain2, email@domain3) Would you recommend any suite that fits my needs? Either (a system to be installed on my server) or (a remote service where I need to config MX records) will do. Thank you.

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• IMCEMAILTO and exghost

  - by Steve

  One of my associates sent an email to me that was also sent to a client. The client's email address appears to be mangled, however. He says he sent it twice---the first one bounced and the second did not. The email address he sent it to was: [email protected] My searches on Google indicate that the MAILTO could be a bad protocol but I didn't know how the email address would be interpreted by exchange server. What email address was the email sent to, how did IMCEMAILTO get there, and does it have any change of getting delivered?

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