Finding problems in a program and trying to solve these.

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44 views

How to find IP address of ADSL modem? [migrated]

Our fall back Internet connection uses a SpeedStream 4100 modem, which just broke, so I have replaced it with a new one. I need to configure it to bridge mode, but I can't even find its IP address. ...
-1
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1answer
38 views

Tons of 500 errors like - fcgid:warn Bad file descriptor: client mod_fcgid: ap_pass_brigade failed in handle_request_ipc function

I copied a site over to GoDaddy from LiquidWeb because LW experts were unhelpful even if more knowledgeable. GD is hit or miss. On the Godaddy hosting I get 500 errors constantly when in admin ...
1
vote
1answer
99 views

Tracking down a memory leak

I previously asked a question about a server that had a very high nonpaged pool memory utilization and someone explained how to use poolmon to track down the problem driver. I did this, but I'm not ...
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0answers
15 views

Tomcat 7 individual deploy logs

I (as a sysadmin) have setup tomcat 7 to autodeploy .war files for users which works well. However, if there are deployment errors, they are logged to catalina.out, which is not readable by the users. ...
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0answers
38 views

Error with a specific bash script

I must first of all shamefully admit that I unfortunately know nothing about scripts... I am simply trying to use one that seems to fit my goal. I am running a VPS node with OpenVZ, and I need a ...
0
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1answer
61 views

Debugging random SQL login failure from Web Server

This is a very basic level question, but it could really benefit from some extra help in the diagnosis. We have a 2005 SQL Server Named: SERVERNAME-PROD We have a Web Apps Server that's running IIS ...
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0answers
14 views

Method started exited with status 96 during server configuration

I have this exact same error where "Method started exited with status 96". It seems the solution A default Solaris Apache install will be provided with several template files in ...
0
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1answer
39 views

Installation of FreeBSD freezes on VMware

I am trying to install FreeBSD on VMware by mounting FreeBSD-9.2-RELEASE-i386-dvd1.iso. The installation proceeds fine untill i reach the following screen I have been waiting for an hour and ...
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0answers
56 views

Debug.log file not being generated by Wordpress

I moved to a new server and I can see that even though I enabled the wordpress debug via define('WP_DEBUG', true); define('WP_DEBUG_LOG', true); The debug.log in the wp-content folder is not being ...
-1
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2answers
33 views

Querying a webserver as if request came from a certain remote IP?

I am having trouble with my Apache web server configuration since a number of remote clients receive 404s, while the majority of clients (me, locally, included) do not have any trouble (status 200). ...
0
votes
1answer
246 views

Linux kernel bug w/ netns and/or Xen guest - “unregister_netdevice: waiting for lo to become free”

I am running a web crawler in a Xen-based VM (on Linode); it makes heavy use of network namespaces to control use of VPNs on a per-crawl-process basis. It's been running mostly continuously for the ...
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0answers
53 views

WinServer 2003 R2: Socket Error#10060

So I inherited a legacy in-house application, that is supposed to have printing functionality. However, whenever a user prints, it conks out with the following error, "Message: Socket Error #10060, ...
6
votes
4answers
785 views

How to pinpoint which process/activity/software/protocol is slowing down LAN on a single computer

From this question about debugging our business LAN I've been able to pinpoint a single computer which slows down our network. When the computer is turned on and connected to the network, roughly 5% ...
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vote
2answers
73 views

How to pinpoint why a specific ressource (image or library) slowing down page load

We have a small network (maybe 15 users at top business hours, around 30 devices) managing internet connection and phone lines. The primary use of the network is for users to access the web based ...
-1
votes
1answer
103 views

Debugging slow network [closed]

I've been tasked with debugging why my company's network connection is running slow. Having no previous experience in this field I have absolutely no clue where to begin or what tools to use. The ...
3
votes
1answer
1k views

Describing `strace` command output

I have php process which could not finish for more then 2 days. root 26511 0.0 1.6 407788 27684 ? Ss Jul09 0:08 /usr/bin/php action.php This is the output from the strace command: ...
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0answers
524 views

Fiddler doesn't work on Windows Server 2012

I can't get Fidller to show any traffic whatsoever when installed on Server 2012 Standard. Any hints on what needs to be enabled or disabled or clicked to make it functional? Just in case, Fiddler ...
12
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2answers
3k views

Kernel stack trace to source code lines

Given a kernel stack trace as below, how do you determine the specific line of code where the issue occurred? kernel: [<ffffffff80009a14>] __link_path_walk+0x173/0xfb9 kernel: ...
0
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1answer
149 views

APC resets after a few seconds

Got a new server and the host installed APC for me. Reloading apc.php shows that ACP resets itself every 4-6 seconds. Uptime is always 0 and hits never go above 3000. The site runs smoothly but if ...
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2answers
261 views

How to debug Repository.fetch_changesets runned from ./script/rails runner

For some time I have been updating changesets manually on server with following command's: $ cd /custom/www-data/ $ source /custom/www-data/.rvm/scripts/rvm $ ./script/rails runner ...
0
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1answer
37 views

How to watch a file, who accesses or uses [duplicate]

I am looking forward a way to watch a file to get following information Which process does open, read, write it? When? Result. (e.g. can they write on it, or can they read it, etc.) Strace helps ...
0
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1answer
752 views

Website goes down for just me. How should I diagnose (what log files to check?) (Nginx + php5-fpm)

Summary I've been running a website on a VPS and I ran into my first bit of downtime (~4 minutes). However the website was only down for me and I can't see anything in the obvious log files. Where ...
1
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1answer
1k views

Puppet: class already declared

I'm currently in reorganising the structure of my puppet code to a model, which uses, profiles and roles. I've started with profiles and was testing, but already run into issues :/ In my node ...
0
votes
1answer
134 views

Where should I start to try and debug a CPU spike and timeout when logging in to a Moodle site?

apologies for the newbie nature of this question .. I am a web developer though don't have too much experience maintaining servers or debugging and fixing performance issues. I have a Moodle site ...
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1answer
230 views

tail command not updating output for debug files

I know that tail -f /var/log/messages will be keep updating on screen as the contents of file gets updated. But when I tried the same thing with a debug file system's file it is not working , any ...
0
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1answer
2k views

How to analyze Debug Diagnostic Tool v2.0 dumps on 2003 Server x86

Debug Diagnostic Tool v1.2 comes with a log analyzer (sometimes). I can't find the analyzer component in Debug Diagnostic 2.0 when installed on 2003 Server x86. What's the recommended way to ...
2
votes
1answer
1k views

How do you disable Just-in-Time debugging messages?

In a relatively new installation of Windows Server 2008 R2, there are occasional popup messages about Just-in-time debugging. These may come up in w3wp.exe when a search bot accesses an aspx ...
2
votes
2answers
142 views

View headers of HTML requests to apache

Is there a good way of viewing a detailed version of incoming requests to apache? At the minimum I'd like to check for the existence of a specific header and check its value. Requests are not coming ...
0
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1answer
214 views

how to debug mysql has gone?

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 ...
3
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1answer
110 views

Investigating a potential CPU failure

On a Ubuntu server that I am using for computations I have recently observed that some CPU extensive programs (GUROBI,CPLEX) often segfault. Being in correspondence with tech support of the ...
1
vote
1answer
496 views

Lighttpd won't start when fastcgi.debug directive is used

I'm running lighttpd/1.4.28 (ssl) on Ubuntu 12.04 LTS. Everything's working, and I'm trying to do some performance tuning. I'd like to enable debug mode for the fastcgi module, however when I add ...
1
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0answers
36 views

Windows app not allowing debugging

I'll start by saying, I am not sure if this should go in StackOverflow or ServerFault. I posted it in StackOverflow earlier, but its been getting votes to close the question, so I assume it should be ...
12
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1answer
598 views

ext4 listing of files very slow in one specific directory that contained lots of files before

Background I had a small logrotate misshap... Logrotate would rotate the archived logs by misstake causing a quadratic growth of files in my /var/log/. And by the time I caught wind that something ...
2
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0answers
527 views

How to debug CGI over fcgiwrap/nginx

I serve executable scripts (mainly in C) through fcgiwrap connected with nginx. Since the scripts are complied, I can get the coding errors during compilation, but sometimes I receive CGI errors ...
2
votes
2answers
72 views

How to obtain last bash error

I am working with a terrible project. It uses a lot of messy shell script in background. Script might include some other scripts. And many error outputs were redirected to /dev/null. When a script is ...
3
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1answer
203 views

Windows 2003 r2 reboots after a few seconds from initiated

I'm having troubles with a virtual machine on a ESXi running windows server 2003 r2. The problem is that every time it initiates and displays the login window, the machine reboots with no warnings, no ...
1
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1answer
635 views

Debugging logrotate postrotate script

Following is my logrotate conf. /mnt/je/logs/apache/jesites/web/*.log" { missingok rotate 0 size 5M copytruncate notifempty sharedscripts ...
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votes
3answers
101 views

How to debug and prevent flaky unreliable IT environment? [closed]

I am not an IT admin, I'm a software developer (microsoft stack) and I'm trying to understand what is wrong with the IT environment of one of our customers. We have deployed our client\server ...
0
votes
2answers
5k views

Debugging a connection refused response on port 21

My colleagues and I are having trouble accessing Heart Internet's FTP servers. We are running a mixture of Macs and PCs and we have a Linux box in the office too. None of our machines can connect. ...
0
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2answers
573 views

Log PHP-script that take long time to render

I would like to find out, which pages on my server are really slow. Is it possible to log all pages that took longer than 2 seconds to render in a file? /var/log/php/php-slow.log Or could the ...
0
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1answer
101 views

Add causing php-script to mysql-slow.log

If you enable the line log_slow_queries = /var/log/mysql/mysql-slow.log in /etc/my.cnf or /etc/mysql/my.cnf then that will log all queries, that take longer than the setting in long_query_time. ...
1
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1answer
383 views

If I have a process which is supposed to be receiving data from multicast, how can I check if it actually is?

I can check gstack, but just because I see the listener threads on the recv call does not mean that call is not returning. One other thing I thought was to do something like: netstat -lupe | grep ...
0
votes
1answer
282 views

strace vs. log4cxx performance hit?

I need to debug some issue on a production server, and I'm trying to decide whether to use strace or the log4cxx logging library; one crucial characteristic I need to know before, is which of the two ...
2
votes
1answer
2k views

How to debug Node + Socket.io CPU Issues

We are running a Node Socket.io server with Express 3. The server is monitored using Forever. The service is running well, but the CPU grows throughout the day, until it reaches 90%+ and then suddenly ...
0
votes
2answers
254 views

Server does not load WordPress - No HTML nor PHP Errors

I just switched my Dreamhost WordPress site on my VPS from PHP 5.2 Fast CGI to 5.3 CGI. Somehow WordPress now refuses to load and shows a white screen of death on all WordPress pages. PHP Info and ...
0
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1answer
203 views

Can pingdom shut down/slow down a site on Heroku?

We have a Rails app on Heroku. We have 2 dynos. We're noticing that the site is not loading today with frequency. Lots of Request timeouts. Also, assets in particular, which are also hosted on ...
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2answers
35 views

debugging cache control

How can I check if a website is being cached correctly? I would like the webpages to be cached by browsers, but I also would like that page updates be visible immediatly when a user visits teh ...
0
votes
1answer
53 views

increasing log level to catch issues

How do you increase the log level for apache to add coredumpdirectory and to catch any segfaults. I am trying to debug some issues and need apache to log every little bit of activitiy.
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votes
1answer
68 views

Investigate why user has access to a folder [closed]

How can I understand why a particular user has access to a particular shared folder? Security tab of the folder contains a long list of groups groups and the user is not a direct member of any of ...
0
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2answers
278 views

CherryPy 3 with Apache 2 using ModWSGI: stack traces?

I am trying to show stack traces or at least some sort of errors rendered to the HTML response while using a WSGI script. A ModuleNotFound exception is raised when I tried to import a module the ...