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3answers
2k views

How to find out the cause of linux server crash after rebooting

Here is the deal, come to work only to find out one server isn't responding at all, the machine is turned on, but the screen doesn't show anything att all, doesn't respond to keyboard inputs (I don't ...
5
votes
2answers
5k views

How can I debug a docker container initialization?

I had an issue with a container, even though it builds perfectly it does not properly start. The cause is a workaround I've added to the Dockerfile (for having a self-configured /etc/hosts routing) ...
0
votes
1answer
676 views

w3wp.exe crash (rewrite.dll) IIS 7.5

I'm experiencing several crashes in the last days on our production server and I can't figure out how to fix this issue. The server hosts an ecommerce application, written in classic ASP, that runs ...
1
vote
1answer
23 views

How to get a debug output from the find command?

I have the following find command: find /home/ -type d -name "something" what I want to achieve is to know which directory/file is checked by the find command no matter the fact that it does or ...
0
votes
1answer
112 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 ...
3
votes
1answer
128 views

ISC DHCPD memory leak solutions and or workarounds

Background: I have recently been put in charge of finding the root of and/or fixing a memory leak with an ISC DHCPD (4.2.5-P1) installation on a Debian (Lenny) Unix server. I have been researching ...
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votes
2answers
4k views

check port open without telnet [closed]

What do people use when Telnet is not installed to check a port is open and reachable? E.g. I used to use the technique of telnet <destination> and know it was there, even if telnet could not ...
1
vote
1answer
116 views

How to analyze a windows system hang (not crash)

I've got a customer with intermittent System hangs. The System in case is a Windows Terminal Server 2008R2 SP1. Sometimes one session in the Server will freeze. Everyone else can work as usual, but ...
0
votes
1answer
194 views

mongodb : Can create new thread on FreeBSD?

We experienced some strange thing in our mongodb gridfs platform. The platform actually is a bi Xeon E5 (bi quad core) with 128GB of memory, running on freebsd 9 with a zfs pool dedicated for mongodb. ...
1
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1answer
346 views

Windows DNS Debug Logging Performance Impact

Similar to this question, Logging DNS requests on a windows DNS resolver, I am curious how much of a performance hit/impact enabling DNS Debug Logging will have on a server. Per the Microsoft links, ...
0
votes
1answer
25 views

How to prevent printing of “debug path” in stdout?

Sys Vers: ubuntu precise 12.04 LTS I seem to have a config setting that forces an executable to log to stdout (or stderr) the current directory it walks through. All commands execute successfully ...
-1
votes
1answer
192 views

Building debuginfo RPM at alternate prefix

I have an RPM that I'm building to install at an alternate root via %define _prefix /home/other/root This works fine for the binary package. The -debuginfo package, however, still lists all of its ...
1
vote
1answer
179 views

Where are the available debug tokens for the Net-SNMP tools listed?

In snmpcmd(1), under "Generic Options", it says, -D[TOKEN[,...]] Turn on debugging output for the given TOKEN(s). Try ALL for extremely verbose output. What tokens ...
3
votes
0answers
919 views

Analyzing BSOD dump file from Windows 2008 R2 SP1

I have a problem with a virtual Windows Server 2008 R2 SP1 server running withing VMWare. The server is running Citrix and also has Symantec Endpoint protection installed. It randomly crashes and goes ...
1
vote
1answer
138 views

Different Linux Distributions Producing Different Machine Generated Code [closed]

I have a very interesting and frustrating issue. The company that I work for uses an application to do simulation and verification for electrical engineering. This application produces output based ...
0
votes
2answers
457 views

why nginx rewrite post request from /login to //login?

There is a if statement, which will rewrite url when the client is Android. Everything ok. But, something got strange. Nginx will write post request /login to //login, even if the block of if ...
3
votes
1answer
208 views

Why does strace open, read 512 bytes, and THEN fstat libncurses?

I've got the following strace output that I'm going through to teach myself a little more about the flow of programs. Here's the section that's confusing me: 16:08:02 open("/lib/libncurses.so.5", ...
1
vote
1answer
3k views

Java process (OpenDS) consumes all cpu (futex flood) - how to debug futex?

Today I noticed that my LDAP server (OpenDS) consumes 100% CPU on every available core. Fast diagnose showed me that there is a lot of ETIMEDOUT during the futex lock. How Can I debug it to figure ...
1
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2answers
1k views

Display “iftop” on web

I do iftop -i eth1 > out.txt It does produce the file with "encrypted" UI content such as [(B[)0[[1;80r[[mO[[?7h[[?1h[=[[H[[J[[0;7mO Listening on eth1 [[1;48H[[mO12.5Kb Is it possible to display ...
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votes
1answer
54 views

Whom to request debug analysis assistance from Microsoft? [closed]

I believe our organization has a MSDN subscription from Microsoft. While scouring the Internet for information to assist with crash dump analysis I noticed a post stating that there is some limited ...
0
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2answers
373 views

Debug VPN latency

Our openVPN VPN is having random latency issues (in particulier with ssh and smb). How can I determine the cause of this latency? Can I play on the MSS with iperf for example, and how?
0
votes
1answer
98 views

Debug kernel booting to blank screen

I have a machine which works fine with the precompiled 'generic' ubuntu kernel (3.0.0-13) but when I try to boot up the precompiled 'virtual' ubuntu kernel (3.0.0-13) it just puts me on a blank screen ...
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2answers
4k views

How to see PHP error stack trace/dump?

Currently my web application can print error when host on my local machine. When I host it on Amazon EC2 server. The error page is empty/blank. I want to see the error stack trace when run on EC2, ...
0
votes
2answers
3k views

Postfix still trying to send spam despite closing open relay

I have a small server at home, which has postfix installed. It's only use is to return the results of cronjobs and email out externally for a few other scripts. I use my ISP's mail server as a relay ...
1
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2answers
165 views

How to analyze system calls when your disk is in read only and strace output is “Bus error”?

We have a HW problem with the disks, that made all the mount points to be read only. Output of dmesg: end_request: I/O error, dev sda, sector 15574609 sd 0:0:0:0: SCSI error: return code = 0x00040000 ...
1
vote
1answer
72 views

Tools to help identify unknown server issue

We've been struggling to identify a issue where all our bespoke systems crash at least once a day. We haven't changed all our systems to we're trying to pin down what else has changed which is ...
1
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1answer
89 views

PHP server --enable-debug side effects

Is it safe to compile php with --enable-debug on a production environment server? Which could be the consequences?
3
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3answers
1k views

Identifying a process that leaks memory

On a linux server (Ubuntu Lucid), my used swap keeps growing by the hour on a server, and I'm having a hard time identifying which process is growing in swap. What tool can I use to monitor this?
0
votes
1answer
690 views

Asterisk debug dialplan with incoming number and callerid

How to debug dialplan with incoming CallerID ? im haveing context [pstn] with incoming _1000 number and CallerID = 123123123 ("external number of calling person") How can i locally check this ...
11
votes
4answers
19k views

Switch on PAM debugging to Syslog

I hate PAM since it came up. How do I switch on PAM debugging in Debian Squeeze at the admin level? I have checked every resource I was able to find. Google, manpages, whatever. The only thing I ...
5
votes
5answers
13k views

How can I enable logging for requests going through mod proxy

Is there a way to log requests going through mod proxy? I need a way to debug my configuration, because I don't seem to be getting where I should be. I need the following information: headers of ...
0
votes
1answer
508 views

What does this Windows 2008 Debug output mean, I found using DebugView and it hangs my app without killing it?

I received a new VM from IT dept. It has Windows 2008 and VMWare tools installed. I have installed my .NET 4 windows service on the machine which does lots of HttpWebRequests. I was looking at ...
2
votes
4answers
5k views

High CPU from httpd process

I am currently getting high CPU on a server that is just running a couple of sites with very low traffic. One of the sites is in still development going live soon. However, this site is very very ...
1
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1answer
639 views

How to enable debug logging for GRE?

How to enable debug logging for module ip_gre on linux 2.6?
2
votes
1answer
395 views

Vista cmd shell thinks it's Windows Server 2008 DEBUG

Never seen this before - My vista cmd shell started displaying everything in yellow and outputs the following as soon as I start it: Setting SDK relative to C:/Program Files/Microsoft ...
2
votes
2answers
1k views

Help trying to figure out why IIS7 is crashing / locking up / denying connections

I've got a pretty busy website that is running on a single web front end machine, on W2K8 + IIS7. Every now and then - eg. maybe monday at 3am or something, then a few days later .. some early ...
1
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1answer
2k views

How do I use ISDN debug on a Cisco router to troubleshoot PRI phone issues?

We have a Cisco 2811 with UCM E 7.0 running our phone system. It is connected to the PSTN by a VWIC2-1MFT-T1/E1 card connected to a PRI from the phone company. From time to time of late, we are ...
7
votes
6answers
28k views

What is the maximum memory that an IIS6 web site/app pool can use?

I have an IIS 6 server running on Windows 2003 SP2 x86. The server has 4GB of RAM and runs consistently with 2GB allocated. I realise that with x86, the server won't utilize all of the 4GB RAM and ...
3
votes
2answers
2k views

How do I debug an IIS problem where the requests queued suddenly ramps up and the server can't respond?

I have an IIS 6 server serving an application using a mix of classic ASP and ASP.NET. I'm increasingly getting problems where the number of requests in the ASP.NET requests queue (observed using the ...