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• Clarification of the difference between PCI memory addressing and I/O addressing?

  - by KevinM

  Could someone please clarify the difference between memory and I/O addresses on the PCI/PCIe bus? I understand that I/O addresses are 32-bit, limited to the range 0 to 4GB, and do not map onto system memory (RAM), and that memory addresses are either 32-bit or 64-bit. I get the impression that memory addressing must map onto available RAM, is this true? That if a PCI device wishes to transfer data to a memory address, that address must exist in actual system RAM (and is allocated during PCI configuration) and not virtual memory. So if a PCI device only needs to transfer a small amount of data at a time, where there is no advantage to putting it into RAM or using DMA, then I/O addressing is fine (e.g. a parallel port implemented on a PCI card). And why do I keep reading that PCI/PCIe I/O addressing is being deprecated in favour of memory addressing? Thanks!

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• Deploy multiple django instances on one Host [migrated]

  - by tvn

  I am trying to setup multiple Django instances on one Host with lighttpd. My problem is to get Djangos FCGI working on subdirectories served by my Webserver. So my aim is the following: www.myhost.org/django0 - django1.fcgi on localhost:3000 www.myhost.org/django1 - django2.fcgi on localhost:3001 www.myhost.org/django2 - django3.fcgi on localhost:3002 Unfortunately the following configuration doesn't even work for one: $HTTP["url"] =~ "^/django0/static($|/)" { server.document-root = "/home/django0/django/static/" } $HTTP["url"] =~ "^/django0/media($|/)" { server.document-root = "/usr/lib/python2.7/dist-packages/django/contrib/admin/media/" } $HTTP["url"] =~ "^/django0($|/)" { proxy.server = ( "" => ( ( "host" => "127.0.0.1", "port" => "3001", "check-local" => "disable", ) ) ) } The only response I get is an 404 and even this takes a long time till I get this. I found nothing suspicious neither in the access.log nor in the error.log.

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• SMTP 25 blocked externally

  - by Jeff

  not sure how to title this question... we run an exchange server with around 80 internal users, all outgoing mail is relayed off a smart host (ISP smtp server) so nothing is actually sent to the world via our server. i wanted to check the server, locally i can telnet to port 25 with no issues and receive the esmtp service ready reply. whenever i do it from an external address (off our local network) i receive unable to connect error 10060. can this cause problems with SPF records, and reverse DNS ? should my exchange server be able to accept smtp requests, requiring authentication before i am able to send from external addresses? if so how... also the exchange server is behind a NAT (asa) device, more than likely thinking that the nat is not configured to route the smtp 25 request to the exchange server.. thanks

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• JBoss basic access

  - by user101024

  I have JBoss 5 deployed on Solaris 10 - the servers connection has unrestricted high ports (1023) open to the internet. I can access the box via ssh & FTP from a second server on the same subnet and anywhere over the internet. JBoss is running over port 8080 and is accessible via http://locahost:8080 on the box itself. I cannot access it via http://ip.add.goes.here:8080 from either the other server on the same subnet or via the internet. Is there any service or configuration within JBoss or elsewhere on Solaris 10 that needs to be changed from default to allow http traffic to be served? Thanks, Kevin

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• Event 4625 - Logon Failure - Server 2008 R2 is logging them all over the place ! How to stop the attack?

  - by user72593

  I've been monitoring failed logons to a server which is directly connected to the internet with no hardware firewall in the way...testing purposes only. Using the Server 2008 R2 firewall, I blocked access to just about everything except RDP, then I told the firewall to only allow connections to the RDP port from "MY" static IP. I tested from other locations and I am not able to login to the server unless i'm at my office. So how are people coming from Chinese IP's able to attempt logons and get logged as failures ?? Is there something i'm missing that needs to be blocked? Any help would be appreciated.

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• Spoof database connection to be local instead of remote

  - by spydon

  I am trying to connect one of our clients "as is" programs to a remote database instead of a local one, they say that they have coded it to be able to do it, but for some reason the program crashes when trying to connect to a remote database. I don't have the source code so I can't really dig much deeper than that and the company does not provide any upgrades or custom modifications. I can succesfully connect to the database through SqlDbx and HeidiSQL so I know that the server is set up correctly. This is why I need to find a way to spoof a remote connection on port 1433 to appear like a local database connection to the program. I thought about editing the hosts file, but it will most likely crash other programs if I bind localhost to another IP than 127.0.0.1. Any ideas?

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• Load balanced proxies to avoid an API request limit

  - by ClickClickClick

  There is a certain API out there which limits the number of requests per day per IP. My plan is to create a bunch of EC2 instances with elastic IPs to sidestep the limitation. I'm familiar with EC2 and am just interested in the configuration of the proxies and a software load balancer. I think I want to run a simple TCP Proxy on each instance and a software load balancer on the machine I will be requesting from. Something that allows the following to return a response from a different IP (round robin, availability, doesn't really matter..) eg. curl http://www.bbc.co.uk -x http://myproxyloadbalancer:port Could anyone recommend a combination of software or even a link to an article that details a pleasing way to pull it off? (My client won't be curl but is proxy aware.. I'll be making the requests from a Ruby script..)

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• How to configure Apache to act as an SSL proxy to an application server?

  - by ripper234

  I have one physical server that runs: an Apache (httpd) server another web server (let's say Tomcat for sake of argument) on port 1234 Can I configure the Apache server to act as a proxy for SSL traffic, while keeping the application server blissfully unaware of SSL? What I imagine is: Traffic to http://myserevr.com/app is redirected to https://myserver.com/app Traffic to https://myserver.com/app is proxied to the application server. My SSL certificate is only installed on the Apache server, not on the Application server Other traffic to the Apache server (http://myserver.com/anotherapp) is served directly from the Apache server What's the best setup to achieve this? (On Ubuntu, if that matters)

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• iptables change destination IP without DNAT

  - by Mad_Ady

  Hello, I'm trying to workaround a broken application which insists on connecting to the private address (and thus unreachable) of a server, instead of connecting to the public address (even if the relevant port is open). Changing the application is not an option. I'm trying to add iptables rules on the client(s) to change the destination ip for the packets going to 192.168.251.3 to go to 1.2.3.4 instead. DNAT isn't working since 1.2.3.4 is not an IP on any of my client interfaces. Can anyone point me to the relevant documentation that allows me to use MANGLE to change destination IPs?

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• Tool to automate basic connectivity testing

  - by feicipet

  After our vendors have setup a certain test environment, we need to go in to perform connectivity testing between PC to servers and also between servers. The problem is that we run a range of tests to telnet between 2 nodes on several ports and this is a manual and rather tedious process. Does anyone know of a small tool or script that I can take input on the range of ports to be test and will run an automated range of testing against those ports? All I need to do is to validate whether a TCP connection can be established from the source PC / server to the target server IP address / port. Thanks, Wong

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• Dns.GetHostEntry is not giving me a good IP to pass to IPEndPoint function in my domain

  - by Beach Miles

  My c# code from my asynchronous socket client to get the address of my socket server. string testServerIP = "192.168.0.1"; IPHostEntry ipHostInfo = Dns.GetHostEntry(testServerIP); //time server address IPAddress ipAddress = ipHostInfo.AddressList[0]; IPEndPoint remoteEP = new IPEndPoint(ipAddress, port); I get the following error message from the above code. CheckServerReconnect:Cant connect to 192.168.0.1 The requested name is valid and was found in the database, but it does not have the correct associated data being resolved for

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• Do any of the HP printers have implement printer sharing?

  - by BCS

  I've seen several (home grade) HP prints that have network port and allow connecting to them via that. However I haven't seen any way to use it without installing the printer specific drives. This seems a bit silly because I've seen printer sharing system (SMB I think) that didn't seem to need any printer specific software. My question is: Is there a way to use one of these with my printers? (I'm omitting the exact model in the hopes that answers for several models (or a resource that answers it for several models) will be given.)

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• Can't connect to service on ubuntu?

  - by user36914

  I have a service i just installed on a ubuntu workstation machine. Say its running under port 511. I can connect locally : telnet localhost 511 When i try to connect from a remote machine it fails telnet 192.168.0.1 511 Whats wierd is i tried to connect locally using the ip address and i get the following error: "Unable to connect to remote host: Connection Refused" I checked the status of the firewall: sudo ufw status and get back "status:inactive" So does anyone know why i can't connect remotely since the firewall is disabled and why can't i connect locally using its ip address. I don't know if this matters but its running under esxi.

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• Two routers in a LAN

  - by taxi

  router A no wifi +--- pc01 +--- pc02 | +--- router B wifi +--- pc03 +--- printer In my LAN I have a modem-router (say A) (no wifi connection) acting as DHCP server, and connected to the Internet. Now, I want to add another router (say B) (with wifi connection) to the LAN, in order to connect wifi pc's and net printers. Here I would disable DCHP server functionality. Is it correct to connect router B to router A via an ethernet port? In router A I define an IP address (eg 192.168.1.100) to be assigned to router B (MAC address). I expect to see router B listed as an attached device, in router A's status, but on the contrary it is not listed.

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• Remote connect to mysql server?

  - by LF4

  I've been trying to figure out why I keep getting this error when I try to connect to the MySQL server with the following commands. $~ mysql -u username -h SQLserver -p Enter password: ERROR 1045 (28000): Access denied for user 'username'@'myIP' (using password: YES) I've done the following: Port is open in the firewall other wise I wouldn't get the error it'd just timeout. MySQL server not running with skip-networking or bind-address username has host as '%' and I can connect locally so the password is correct. GRANT USAGE ON *.* TO username@% IDENTIFIED BY 'password'; FLUSH PRIVILEGES; I wanted to know if anyone had ideas or ran into this issue before and solved it? mysql> select user, host from mysql.user where user='username'; +----------+------+ | user | host | +----------+------+ | username | % | +----------+------+ 1 row in set (0.00 sec) mysql> show grants for 'username'; +----------------------------------------------------------------------------------------------------------------+ | Grants for username@% | +----------------------------------------------------------------------------------------------------------------+ | GRANT ALL PRIVILEGES ON *.* TO 'username'@'%' IDENTIFIED BY PASSWORD '*F42AD03PASSWORDHASHADF4021C86B' | | GRANT ALL PRIVILEGES ON `DB2`.* TO 'username'@'%' | +----------------------------------------------------------------------------------------------------------------+ 2 rows in set (0.00 sec)

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• Cisco ASA Multiple Public IP

  - by KGDI

  I have a Cisco ASA5510 and articles related to ASA and mulitple Public IP says this cant be done. My question is how to best solve a scenario like this: I have 3 zones, Outside, Inside and DMZ Outside is Internet Inside is Client machines DMZ is a zone for servers related to external and internal services. My scenario is a bit more complex, but to keep things simple this will do: I want to place an Exchange server and a web server (externally reachable in the DMZ zone) The webserver uses both TCP80/443, the Exchange server uses 443 So to the problem: With the ASA only having one public IP, how would you make a DNAT to port 443 on both the internal hosts behind 1 Public IP? Usually, when i do this kind of scenario With Linux boxes i use alias Interfaces like eth0:0, eth0:1 and set 1 Public IP on each. To me this must be a pretty common scenario, any ideas on how to solve it With ASA? /KGDI

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• accessing external mysql server through "ssh tunnel" - any drawbacks?

  - by Max

  In an upcoming project I have a two server setup: one is the application server and another, already existing runs the mysql server with databases I need to access. I contacted the server admin of the mysql server and the only way I can access the remote mysql databases is via "SSH tunnel". I have never done this before and never heard of it so far, so my question, are there any drawbacks, e. g. performance wise? Isnt it rather slow compared to directly accessing the mysql server on its default port?

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• Can't access link in network using fully qualified domain name

  - by user1033715

  I have installed windows server 2003 and configured Domain controller (domain name - xyz.com) and DNS service. for that I have configured fully qualified domain name as server.xyz.com also I have installed apache tomcat with port 8080 on that server and accessed link successfully using "http://localhost:8080", "http://ip address of server:8080", "http://server.xyz.com:8080". but its working for local machine, and when I tried to access it from another machine in same network using "http://ip address of server:8080" its worked for me. but when I tried it using fully qualified domain name i.e. "http://server.xyz.com:8080" it's giving me error, "Could not connect to server.xyz.com" Please guide me getting this setup done. I need to be able to access this link "http://ip address of server:8080" as "http://server.xyz.com:8080" outside my network Any suggestion are highly appreciated..

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• Windows 7 treating my third monitor as an extension to my second rather than detecting it as a stand alone

  - by user331837

  I am trying to attach a third monitor to my PC, however I am coming across a rather strange issue. Windows screen resolution is still only showing that I have two monitors connected, but the second has been extended over both the second and third monitors. Basically, it shows as the main display being a normal size, and the secondary as being twice as long as normal. I have my main connected via a the display port, and the second and third are using two of the three mini HDMI ports my video card provides. How do I get windows to accept my third monitor the same as it does my second?

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• Solr on Tomcat (Ubuntu OS) installation help

  - by Camran

  I have to install Solr on my Ubuntu Server. However, Solr wont work without Tomcat or another container, and also Java. I have successfully installed tomcat6 and java. BUT, in a tomcat6 guide online, it says I should configure iptables to allow connections via port 8080, which I have done. Then the guide says I can test the tomcat6 by going to: http://my_ip_adress:8080 But this makes the browser just load and wait somehow for a response, and finally display "website not available". I have NO clue how to install Solr with Tomcat. Does anybody know how? How do I know Tomcat6 works? BTW: When I do this: /etc/init.d/tomcat6 start then it says OK. If you need something let me know, I really need help with this one. Thanks UPDATE: When executing this: sudo /etc/init.d/tomcat6 status it respons is Tomcat servlet engine is running with pid 28641

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• Multiple Monitors on One Screen

  - by Hulihan Applications

  Does anyone know of any software/hardware configuration that will allow you to preview/view the contents multiple monitors on one monitor? Let's pretend: I have two monitors hooked up to one pc, Monitor A and Monitor B. The monitors are not near each other. I'd like to be able to preview/see what's displaying on Monitor B on Monitor A I haven't been able to find much about this, but I imagine it may not currently be possible to access/emulate video output going out of a video port in software. However, wouldn't it be possible to capture display data generated by the OS kernel or data getting passed down to the display adapter driver?

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• Haproxy, configure for one host

  - by Michal K.

  I have to use haproxy on one machine. I want to do redirect requests from Ip to the same ip (with another port). My configuration (doesn't work): lobal maxconn 4096 # Total Max Connections. This is dependent on ulimit daemon nbproc 1 # Number of processing cores. Dual Dual-core Opteron is 4 cores for example. defaults mode http clitimeout 600000000 srvtimeout 600000000 contimeout 400000000 log 127.0.0.1 local0 log 127.0.0.1 local1 notice option httpclose # Disable Keepalive listen http_proxy 127.0.0.1:8080 balance leastconn # Load Balancing algorithm acl acl_apache path_end .avi .jpeg #option httpchk option forwardfor # This sets X-Forwarded-For ## Define your servers to balance server DE2 127.0.0.1:8080 weight 1 maxconn 15 check

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• Should I create a second WAN Interface for a new SSLVPN setup on my Sonicwall 2400?

  - by TheSuperman

  Sonic Wall 2400 I'm setting up a new SSLVPN on our Sonicwall, very new to this. I currently have an exchange server as well, so mail.company.com is directed to our mail server. I'd like to setup a clean link for my low end users, remote.company.com to be for the SSLVPN, but I'm not sure how to do this within the Sonicwall? I setup SSLVPN on port 443. Only 1 WAN setup, on the X1 Interface. We have an A record setup with the same static IP used on the WAN Interface, and is configured for mail.company.com. Should I use a new static IP from our block of usable IP's to create the new Remote.Company.com? If so, I have no idea where to start on this on the Sonicwall? Any suggestions?

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• IIS is not accepting connections after WIndows system update

  - by user78102

  I've been running a web site for the past year on Windows Home Server 2008 R2. After the March 2012 system updates, the site is no longer accessible to clients. They see this error: website is online but isn't accepting connections. Ping tests to the FQDN of the server are successful and NSLOOKUP returns the correct result. The Internet connection tests out good from the server. I have not changed my internet connection (Comcast Business Internet) or my router configuration (I forward incoming requests from the outside to port 80 of the local IP address of the server). I have tried: Disabling the Windows Firewall. Rebuilding the OS and configuration. I still have the problem. How can I resolve this?

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• Other options to "balance source" in haproxy

  - by PriceChild

  I have haproxy listening on several ports and pointed at several backend servers. Ideally, I would like it so that repeated communications to the same port get pointed at the same backend. "balance source" isn't workable because often requests come from the same source. Is this doable? I'm also open to non-haproxy solutions. The protocol being used isn't important but is definitely not http. Just assume its ssh and you shouldn't go wrong.

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