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12
votes
8answers
7k views

How to setup a fake SMTP server to catch all mails?

I'm looking for an smtp service that essentially obeys the RFC, except rather than sending mail it simply logs to a file [date] sent mail to <address> Or whatever. I can bash this together ...
0
votes
0answers
5 views

PHPStorm Error Copying Helpers

I'd previously configured PHPStorm to remote debug with Vagrant but some changes have caused a strange error. I have recently switched the Vagrant nfs to true and I have also downloaded the EAP ...
0
votes
0answers
21 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 ...
0
votes
0answers
14 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
555 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% ...
1
vote
2answers
49 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 ...
2
votes
1answer
1k 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 ...
-1
votes
1answer
45 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 ...
1
vote
4answers
3k views

I need help debugging apache with gdb (no debugging symbols found)

I'm trying to debug a segfault in PHP/Apache running on RHEL4. This is a production server, so I'm trying to install a separate copy of apache and php, and run apache through gdb. When I load httpd ...
1
vote
5answers
5k views

How can I grab a Memory Dump of my W3WP.exe process?

I'm tracking the CPU usage of a recent build I did to our Windows 2008 SP2 server. Here's the task manager screenie... See how it spikes? I wish to find out what are causing em. Before I do ...
5
votes
4answers
7k views

How can I find out what is causing interrupts on Windows?

Occasionally I come across servers (Windows 2003 and 2008) with high processor % interrupt time. Is there a way to see what program or device is causing the interrupts?
1
vote
1answer
382 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: ...
2
votes
2answers
6k views

All connections from this network get stuck in SYN_RECV state, connections from my home or phone properly get ESTABLISHED

My server (a linode VPS) suddenly started to timeout on every request yesterday. I'm pretty inexperienced in networking and would love to learn a process for debugging these connectivity issues. ...
3
votes
1answer
494 views

SQL Server Debugging: “Unable to Step. Invalid operation”

I'm debugging a call to a Stored Procedure in SSMS (2012). Frequently, and various random points in the code, a dialog pops up: Microsoft SQL Server Management Studio: Unable to Step. Invalid ...
0
votes
0answers
184 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
votes
2answers
1k 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: ...
1
vote
2answers
5k views

Unable to start Apache2 service on Solaris 10

This is a default installation of Solaris 10 x86. No tweaks or customization. 1) I first enable apache2. bash-3.00# svcadm enable apache2 2) Restart apache2 bash-3.00# svcadm restart apache2 3) ...
0
votes
1answer
82 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 alyways 0 and hits never go above 3000. The site runs smoothly but if ...
0
votes
2answers
154 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
votes
0answers
137 views

Diagnose dump file which causes SQL Server timeouts randomly

My SQL Server gets random timeouts some days causing the server to slow down, sites not to load, and no data coming back from SQL Server. I have this dump file below, and I am having a hard time ...
3
votes
1answer
917 views

Why can't openSSL verify google's certificate?

When I run the command openssl -connect www.google.com:443 from a Debian VM, I get the following within the output: Verify return code: 20 (unable to get local issuer certificate) What's going ...
0
votes
1answer
31 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
votes
1answer
399 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
vote
1answer
681 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 ...
3
votes
3answers
342 views

Send bash -x output to logfile without interupting standard output

Is there a way to send the information displayed by running a bash script with the -x option to a file, while not changing the standard output seen by a user running the script? This is a debugging ...
0
votes
0answers
58 views

Apache time-outs

I need some help to troubleshoot Apache time-outs. Could you please advise what tolls/steps I can use to troubleshoot this further? Details: CentOS 6.4 Apache 2.2.15 Requests just hang: $ curl -I ...
0
votes
1answer
101 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 ...
0
votes
1answer
115 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 ...
2
votes
3answers
2k views

Failed Request Tracing XML fails to display in Internet Explorer (IIS 7.5)

I have installed the Tracing feature and enabled failed request tracing for a website, to debug a Classic ASP website. The XML logs are created upon occurring errors, however when I open them in IE, ...
0
votes
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
809 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
3k views

How to enable debug of dhcp client on Windows 7

Is it possible to enable some sort of debugging for dhcp client on Windows 7?
1
vote
2answers
173 views

Where (and how) to put PDB files for custom .NET code?

Our developer sent me a PDB file to help debug a custom application. I currently have my symbol directory set to c:\symbols, and several Microsoft symbols are there in this folder format: ntdll.pdb ...
3
votes
1answer
140 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 ...
2
votes
2answers
78 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
votes
1answer
132 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 ...
2
votes
2answers
1k views

Debugging Windows 2008 (Roaming Profile) user logon

I would appreciate some help debugging my windows 2008 profile service. Any domain account that logs on to my 2008 machine gets a +- 20 second waiting time on "user profile service" I am using ...
3
votes
1answer
102 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
293 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
vote
0answers
33 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
votes
1answer
451 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
votes
0answers
320 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 ...
0
votes
2answers
203 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 ...
2
votes
2answers
68 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 ...
4
votes
2answers
6k views

How to debug “HTTP request sent, awaiting response”?

I have a Linux server on an ADSL connection, and I just noticed that sometimes I get Connecting to example.com|xxx.xxx.xxx.122|:80... connected. HTTP request sent, awaiting response... when I use ...
1
vote
1answer
474 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 ...
1
vote
1answer
693 views

How to track down a 403 error in lighttpd?

I am including the following fragment (/etc/lighttpd/sites/local) from the top-level config file (/etc/lighttpd/lighttpd.conf) on a Ubuntu 10.04 LTS (x64) machine with Lighty 1.4.26 ...
7
votes
7answers
4k views

Equivalent of SysInternals FileMon for Linux?

I'm attempting to debug an application on Ubuntu - I need to listen to file open attempts (even for files that don't exist). Process Monitor (formerly known as FileMon) is available on Windows - ...
-4
votes
3answers
72 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
2k 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. ...