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Questions tagged [debugging]

Finding problems in a program and trying to solve these.

202 questions
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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 (Moodle 2.2.3) running on an Apache server (LAMP…
undefined
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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 analyze the dump files without reverting to 1.2? --…
John K
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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 has gone error. One my windows machines apache it…
fefe
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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. When running nmap from my IP address, port 21 does…
Jon
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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 information about the time it took to render be added to…
rubo77
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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 would have lower impact on performance (speed,…
akavel
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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 Heroku, don't completely load, or are very slow to load.…
AdamT
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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.
Mike Janson
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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 script can't seem to find (which is fine for now), but…
vincent gravitas
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how do I troubleshoot rdp

I have one Windows XP SP3 pc on the domain that I cannot rdp into. The xp pc is enabled for rdp sessions. Port 3389 is open in the firewall. There are no errors in the event logs. I have tried to rdp from from a number of different machines running…
Rory
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Coldfusion crashing when I initiate debugging session?

I've been trying to hook up eclipse to RDS for a CF8 testing server I have in my office. Every time I try to test the connection, the CF8 application server service crashes. When I check the event logs, it turns out to be jrun crashing: Faulting…
Scott
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I would like to redirect port 8140 on my public IP address (ip1) to port 8140 on Internet host (ip2)

edit3: i would like to get exactly what is descripted in http://shorewall.net/FAQ.htm#faq1g but it doesn't work for me. edit3 end; os: debian squeeze shorwall: 4.4.11.6-3 3 computers a, b & c; shorewall is on computer b i would like to dnat port…
c33s
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Should I expect ICMP transit traffic to show up when using debug ip packet with a mask on a Cisco IOS router?

So I am trying to trace an ICMP conversation between 192.168.100.230/32 an EZVPN interface (Virtual-Access 3) and 192.168.100.20 on BVI4. # sh ip access-lists 199 10 permit icmp 192.168.100.0 0.0.0.255 host 192.168.100.20 20 permit icmp host…
David Bullock
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How do I find out what's causing an access denied error?

I am getting an access denied error when I try to run a vbs script that uses WMI to do some stuff to IIS on Windows 7. Is there some sort of tool that can tell me what's causing the access denied?
Helephant
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Dummy HTTP Post server

Where can I download a simple Windows GUI app that can consume an HTTP POST, display its contents, and return 200?
ykaganovich
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