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• Why can't my networks reach each other?

  - by HOLOGRAPHICpizza

  We have two Buffalo WZR-HP-G300NH2 routers, with the default firmware, DD-WRT v24SP2-MULTI (10/31/11) std - build 17798. Each has a separate cable internet connection with a public static IP address. They are both in the 24.123.68.0/24 space. Both of them can contact pretty much the whole internet, and they can both be accessed out on the internet with no problem, but for some reason they can't talk to each other! When I try to ping one from the other I always get "Destination Host Unreachable". There are no strange routing or firewall rules in place. And they are both set to respond to pings, I can ping them from outside. Our main IT guy is going to call our ISP on Monday, but I'm impatient, so does anyone have any ideas?

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• CentOS 5 - Unable to resolve addresses for NFS mounts during boot

  - by sagi

  I have a few servers running CentOS 5.3, and am trying to get 2 NFS mount-points to mount automatically on boot. I added 2 lines similar to the following to fstab: server1:/path1 /path1 nfs soft 0 0 server2:/path2 /path2 nfs soft 0 0 When I run 'mount -a' manually, the mount points are properly mounted as expected. However, when I reboot the machine, only /path2 is mounted. For /path1 I get the following error: mount: can't get address for server1 It obviously looks like a DNS issue, but the record is properly configured in all the DNS servers and is mounted properly if I re-try the mount after the reboot is completed. I could properly fix this by using IP address instead of hostnames in /etc/fstab or adding server1 to /etc/hosts but I would rather not do that. What might be the reason for failing to resolve this specific address during boot time? Why the problem is only with the 1st mount point and the 2nd is properly mounted despite having identical configuration?

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• Configuring Bind9 on ubuntu

  - by Jerry

  I am trying to configure name server on Ubuntu just for learning. I have followed this tutorial. After configuring bind9 I have restarted it and works well. I have no registered domain name and public IP, so I have used a random domain name(khalidiitdu.com) that is not registered. When I dig khalidiitdu.com, it shows status: NXDOMAIN. If I use nslookup command, it shows ** server can't find khalidiitdu.com: NXDOMAIN. Now question is: Is registered domain mandatory to configure bind9 within a LAN? If not please suggest me alternative ways. Thanks.....

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• Debugging Connection Issues Between Two Linux Servers

  - by clickfault

  I have two CentOS 5 servers running iptables and apf. I am having issues connecting with ssh from server 1 to server 2. I can connect from server 1 to a third server and from that third server to both 1 and 2. In all cases I am using the IP address and not a host name. I have stopped iptables and apf on all servers and it doesn't seem to change anything. What is the best way to debug this process?

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• how to debug mysql has gone?

  - by fefe

  I have a virtual machine(Ubuntu 12.04, MySQL 5.5) running under VMware and is dedicated to host a mysql server. I connect to this server on internal IP. I'm trying to find out why I get mysql server has gone error. One my windows machines apache it stops because of this issue. I have been trying to fine tune my mysql my.cnf with the following parameters but did not bring the desired result. # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. bind-address = 0.0.0.0 # # * Fine Tuning # wait_timeout = 180 key_buffer = 384M max_allowed_packet = 64M thread_stack = 192K thread_cache_size = 8 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover = BACKUP max_connections = 500 table_cache = 64 #thread_concurrency = 10 # # * Query Cache Configuration # query_cache_limit = 1M query_cache_size = 32M how to debug this issue what is missing from configuration to avoid this error?

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• High Lock Wait ratio in MySQL

  - by FunkyChicken

  on my site I log every pageview (date,ip,referrer,page,etc) in a simple mysql table. This table gets very little selects (3 per minute), but a lot of inserts. (about 100 per second) Today I changed this table from an InnoDB table to a MEMORY table, this made sense to me to prevent unnecessary hard disk IO. I also prune this table once per minute, to make sure it never get's too big. -- Performance wise, things are running fine. But I noticed that while running tuning-primer, that my Current Lock Wait ratio is quite high. Current Lock Wait ratio = 1 : 561 My question: Should I worry about this Lock Wait Ratio? And is there something I can change in my my.cnf to improve things so that the lock wait ratio isn't so high?

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• Port Redirection on Mac OS X Lion

  - by Andreas

  I have tried to solve this issue using pf but with no luck. Basically, I am trying to redirect incoming port 443 traffic to port 22. I have tried to set up a rule in a file and load it in pf but I get syntax error. Can anyone with more experience with pf provide some insight? Here's what I've attempted: pass in on en1 proto tcp from any to any port 443 rdr-to 127.0.0.1 port 22 and pass in quick proto tcp to port 443 rdr-to 127.0.0.1 port 22 I've been able to do this in MacOSX Snow Leopard with ipfw: sudo ipfw add 1443 forward 127.0.0.1,22 ip from any to any 443 in but it doesn't work in Lion (it gives me an Invalid Argument error).

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• VNC unattended Server (No user Interaction)

  - by Louis van Tonder

  I worked on a proof on concept a while ago.... whereby I managed to get VNC going in full "unattended" mode... I.e. The VNC Server dials into the viewer... which is running in Listening mode. The same concept of how single click works, but without the user interaction. I cant seem to locate my source files for this concept I worked on... although I have found my shortcut that worked on the Viewer side to listen. "C:\Program Files\UltraVNC\vncviewer.exe" -listen 5007 /noauto /256colors I can not however remember/locate my demo of what the server is doing.... how to configure it. If I remember correctly, the server was also started with command line params that "dialed" into a remote IP/port, that the viewer is listening on. Any ideas? Thanks

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• REST-based file server

  - by Chris Wenham

  I need to be able to PUT files and GET them later using nothing but HTTP, so I went searching for something that might match the terms "REST file server" or "HTTP file server" or "REST drop-box", etc. Unfortunately, these terms bring up the wrong kind of results on Google. What I want is the equivalent of an SMB fileshare over HTTP. Some ideal features: Can PUT a file of any type at http://servername/service/any/path/I/want/document.pdf Anyone with access can GET that file at the URL I PUT it at Supports AV scanning on any new file that has been PUT Supports DELETE of existing resources (files) Our shop runs Windows, but I'd be interested to know about Unix software that can do this kind of thing, too. It's to be used in an IT department for private users only. It won't be on a public-facing IP address. Does anything like this exist?

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• Removing (Presumably) Extraneous Network Adapters from Device Manager (eg WAN Miniport)

  - by Synetech inc.

  Can anyone shed some light on the default items in the Network Adapters branch of the Windows Device Manager? In addition to the network card, there are always a bunch of other things that I cannot find any useful information on such as RAS Asynch Adapter and all the WAN Miniports (IKEv2, IP(v6), L2TP, Network Monitor, PPPOE, PPTP, SSTP). I would like to trim it down and uninstall whatever possible but cannot find out exactly what these items are responsible for (and therefore whether or not they are needed on my system). Most of the pages found with Google are either people trying to fix an error with such an item or someone asking what it is and being given an unhelpful, pat response like “just leave them alone” or “they’re necessary”. I highly doubt that is the case and I’m certain that at least some items can be removed because even if they become necessary in the future they can be added again (for example installing Network Monitor or Protowall reinstalls the miniport drivers anyway).

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• Port Forwarding on Actiontec GT704-WG Router Issues

  - by adamweeks

  I am trying to setup a server at customer's location that has the Actiontec GT704-WG DSL router. The port forwarding it not working at all. Here's the details: Server: OpenSuse Linux box with a static IP address of 192.168.1.200 Application running accepting connections on port 8060 Firewall disabled Local connections (within the network) working properly Router: Updated to latest firmware available DHCP range set to 192.168.1.69-192.168.1.199 to not have any conflicts with the server Firewall set to "off" Rule set in the "Applications" setting to forward 8060 TCP and UDP to 192.168.1.200 machine (I've tried using the "TCP,UDP" option as well as both individual options) I've also tried just simply putting the server in the DMZ to see if I could connect to anything, but still nothing. Looking for any clues before I call and waste hours explaining the issue to tech support.

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• Terminal Server 2003 Performance Troubleshooting

  - by MikeM

  Let me get your thoughts on terminal server performance problems. The server hosts average 25 users which, after running some numbers, on average use 600MB memory with their main applications running (web browser, adobe reader, IP phone client). All users are on the same LAN as server. We constantly experience slow response and short session lockups. Combined CPU usage is on average 10%. What appears strange to me is that the system shows 29GB physical memory with 25GB of it free. The page file usage is about 50% averaging 9GB used. Some server specs OS: Server 2003 32bit Enterprise with /PAE flag RAM: 32GB CPU: 2xQuad Core @ 2.27Ghz HD: RAID5 1.2GB After doing basic troubleshooting using performance monitor it leads me to believe that the performance problems are caused by the 32bit OS limitation in addressing full 32GB of physical memory even though the /PAE flag is used. Can anyone suggest something, troubleshooting steps that can lead to a more conclusive answer? Thanks

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• Routing application traffic through specific interface

  - by UnicornsAndRainbows

  Hello All! First question here, so please go easy: I have a debian linux 5.0 server with two public interfaces. I would like to route outbound traffic from one instance of an application via one interface and the second instance through the second interface. There are some challenges: both instances of the application use the same protocol both instances of the application can access the entire internet (can't route based on dest network) I can't change the code of the application I don't think a typical approach to load balancing all traffic is going to work well, because there are relatively few destination servers being accessed in the outbound traffic, and all traffic would really need to be distributed pretty evenly across these relatively few servers. I could probably run two virtualized servers on the box and bind each of them to a different external ip, but I'm looking for a simpler solution, maybe using iproute or iptables? Any ideas for me? Thanks in advance - and I'm happy to answer any questions.

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• Django fails to find static files served by nginx

  - by Simon

  I know this is a really noobish question but I can't find any solution despite finding the problem trivial. I have a django application deployed with gunicorn. The static files are served by the nginx server with the following url : myserver.com/static/admin/css/base.css. However, my django application keep looking for the static files at myserver.com:8001/static/admin/css/base.css and is obviously failing (404). I don't know how to fix this. Is it a django or an nginx problem ? Here is my nginx configuration file : server { server_name myserver.com; access_log off; location /static/ { alias /home/myproject/static/; } location / { proxy_pass http://127.0.0.1:8001; proxy_set_header X-Forwarded-Host $server_name; proxy_set_header X-Real-IP $remote_addr; add_header P3P 'CP="ALL DSP COR PSAa PSDa OUR NOR ONL UNI COM NAV"'; } } Thanks for the help !

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• Subdomain only accessible from one computer

  - by Edan Maor

  I recently added a wildcard A record to my domain (*.root.com), mapping it to a certain elastic ip on AWS. I've configured apache to redirect all references to something.root.com to root.com, except for one specific "dev" subdomain, which is hosting its own site (a Django app, specifically). The Problem: This setup works perfectly for me on my computer. But on other computers around the office, it doesn't seem to work. Specifically, trying to visit dev.root.com gives an "unable to find server" error. Pinging dev.root.com gives a "cannot resolve hostname" error. The weird thing: pinging any other subdomain of root.com does work, from all machines. I would think this was all due to DNS propagation, except all the computers are behind the same office router, so how could that be the case? Any ideas?

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• vncviewer connection refused (61)

  - by coure2011

  I have a root access to VPS (centos 6). I have installed VNCServer using this guide line http://tournasdimitrios1.wordpress.com/2011/02/02/how-to-setup-vnc-server-on-centos-5-x-fedora-11/ Everything goes perfectly and server is running via termina. Now I am trying to connect to that server via vncviewer (mac os). but its giving me error Connection refused (61) I am providing only the IP address of the VPS, maybe I also needed port address? How to configure port on vncserver? or its something else?

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• Best way to monitor host

  - by Axle

  I have just set up a host which receives messages from 300b to 1500b (wrapped stx etx)and replies with the same. It works fine but some times it receives junk data. Is there anyway to monitor this out of band data just so we can make sure we are not receiving massive amounts of it. Also is it possible to monitor if connections time out - where the host did not reply in time or long connections where it takes the host 20 seconds to reply when it normally takes 5. I am aware of IP monitor but I don't think it covers enough - Is there anything else or any other way? Thanks in advance!

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• Restrict access to SSH for one specific user

  - by j0nes

  I am looking for a way to secure my servers with the following setup: I have a server where I can log in via SSH. The main account there (named "foo") is secured by a keybased login with password. I have another user account (named "bar") that I use to log in via cronjobs running on other servers - this one also has keybased login, but without password. Now I want to limit access to this machine for the "bar" account. The account should only be accessible via known IPs. However, the "foo" account should not be affected by this, this one should basically be accessible from any IP. How can I manage this? Or is there a simpler solution to everything?

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• nginx proxy pass redirect through load balancer

  - by Brian

  I have several backend webservers that are load-balanced using LVS. These machines have only internal non-routable IPs on them. The load-balancer is the only machine with an external IP. This setup works great. I would like to add another webserver for image serving, but it will not be part of the load-balanced pool. Is it possible to proxy pass from the load-balanced web servers to the image server and have the response redirected to the client? Client--external LB--internal web server--internal image server I've gotten proxy pass working when I remove the LB from the equation, but no luck when trying to use it.

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• VPN ipsec tunnel from router to single windows server computer (gateway-to-host)

  - by Chris Miller

  Firstly, is this possible? The situation: 2 different ISP's. One has several servers and a firewall running. The other is limited to only one virtual server with one network card running windows server 2008r2. I need to set up a site-to-site style VPN using IPsec between the firewall of one ISP and the windows host on the other (gateway-to-host). This host has to run a SQL-Server that I can access from the other ISP's servers through the VPN tunnel. It seems looking at the RFC for IPsec that this should be possible using the features of Windows 2008, but I can't get it to work so far... It seems that I can't access any services running on the same computer or IP address used as the tunnel endpoint? Thanks Chris

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• ASP.NET directories blocked from VisualSVN Server behind reverse proxy in IIS 6

  - by user143344

  I’ve got VisualSVN Server running behind a reverse proxy in IIS 6, Windows Server 2003. This isn’t ideal, but for the main web app on the server I’ve only got one IP address and SSL certificate available. Everything works except for when trying to commit to or browse the default ASP.NET directories (App_Browsers, App_Code, App_Data). SVN commits fail for these directories – which I believe is because IIS will never serve them by default. The reverse proxy uses a virtual directory in IIS – is there a change I can make in the web.config for this virtual directory to get around the issue?

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• Is mumble safe (privacy wise)?

  - by AnonymousLurker

  When chatting on IRC, it is possible to leak data like OS, CPU type if the IRC client happens to leak it in VERSION string. Anybody doing /CTCP VERSION can see it. Same about timezone (/CTCP TIME). This can be mitigated by turning replies to CTCP queries off. Also, IP address is leaked to others (/whois nickname will show it if it's not cloaked). By analogy, does the mumble client expose such sensitive data to others that are connected to the same server? If it does, what are the ways to mitigate this?

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• Firewire 800 with Windows

  - by Amitesh

  I have two windows machine with windows server 2003 installed on them. I am running a Lab View script on 1 machine and storing the data. But since it has less memory, I want to transfer data to another machine using firewire 800. Is it possible to configure out the second machine just as an external HDD attached to it and write data directly to it? (This is possible with MACs) Dont want to use the ethernet (internet/ TCP/IP prot.) to transfer the data. Is it possible? Thanks.

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• IE8/IE7/IE6/IE5 on WinXP Use The Wrong Certificate

  - by Marco Calì

  For some reason IE8/IE7/IE6/IE5 on Windows XP, instead to use the certificate that is listed on the nginx website config, is using another certificate that is used from other websites. Checking the nging config file for the website everything is fine. A confirm of this is that all the other browsers (Chrome/Firefox/Safari/IE9) are using the correct certificate. This is the nginx configuration for the app: server { listen 80; listen 443 ssl; server_name mydomain.com; ssl_certificate /root/certs/mydomain.com/mydomain.bundle.crt; ssl_certificate_key /root/certs/mydomain.com/mydoamin.key; access_log /opt/webapps/cs_at/logs/access.log; location / { add_header P3P 'CP="CAO PSA OUR"'; proxy_pass http://127.0.0.1:20004; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header X-Real-IP $remote_addr; } }

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• TCP connection between PCs in home wi-fi network

  - by Nordvind

  I want to establish a connection between 2 PCs. Point is to practice in writing client-server applications and similar stuff. I've heard around, that I can access another PC in network by address like "Router IP:port number". Am I right or i got it wrong? So how do I configure router to let connections to certain ports? And what would address look like, if I'm, say, connecting to 80 port on my home server? P.S. Will be grateful for links to some tutorials on this matter, if any.

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