Hangs is an speaking term for subsribing the event that a server or program gets stuck in it's own code. This will cause the server to not respond, but will neither shut down. You will only see an frozen screen and can't do anything, besides a force restart by pressing the power button or removing ...

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What can cause an entire Red Hat server to “hang”?

We've got two Red Hat servers which "hangs" at regular intervals. The systems become unresponsive for 20 - 30 seconds, and then return back to "normal". The systems are not virtualized, and runs on ...
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My mail server from ec2 becomes unresponsive (can't ssh, nor manages mails) after 2-3 days

Hy! I have configured my server with http://www.iredmail.org/ and everything worked nice for 1-2 days and then it stopped working. Everything is unresponsive. SSH hangs; Web server interface ...
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11 views

EXSI4.0. 2 different kernels - one boots other locks up immediately, how to check initrd difference

I have a ESXI4.0.0 (v4) host, where I am trying to install a guest. The host machine is a regular Intel PC. I have 2 different ISO images (heavily modified version of SLES for a commercial product), ...
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76 views

mstsc freezes after entering credentials

At some point in Windows session (usually days) I can no longer make RDP connections. When running mstsc and entering credentials, all buttons are getting disabled and the UI freezes. Existing ...
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76 views

libvirt / kvm guests take very long time to start after host reboot

Host system is CentOS 6.5 x86_64. I have setup an Ubuntu guest by following this wiki. The guest works, but: if I reboot the host, it takes a very long time (about 30 minutes on the last reboot) ...
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1answer
87 views

Windows Server 2008 R2 Freezes at Login

We have a Windows Server 2008 R2 install on our company desktop server which has been working fine for the last 3 years (with regular updates) Recently, we restarted our server (due to slow file ...
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1answer
96 views

Linux server hangs, where to look for possible reason? [closed]

Linux server hangs for several times without knowing the exact reason. Which file or log should I look at? The server responds to ping, but I can not ssh to it. And when I plug a monitor into it, it ...
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1answer
641 views

vmware virtual machine keeps freezing

Strangely I have a virtual machine that keeps constantly freezing for some seconds or minutes. On the OS side, the CPU and memory used are quite low. On VMWare side, it's the same, the machine never ...
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121 views

Starting DKMS hangs CentOS Boot

I'm really out of my element here. I haven't done any updates on my server running CentOS 6.4. CloudFlare in front of some of my sites was throwing a 522 error from Nginx. I rebooted the machine and ...
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114 views

Server hangs when copying files, importing db etc

I'm running centos with Plesk ( kernel kernel.x86_64 0:2.6.32-431.11.2.el6). We upgraded to 48GB. Currently we are experiencing strange problem. Whenever we try to copy some file, import database, ...
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ACL PS Script - hangs on 08 R2 PS v3; works fine on W8 PS v4

This script was designed to make application of permissions to a new server much easier. It is not doing that currently :( For some reason it works just fine on my Win 8 machine, where I made it. ...
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923 views

MySQL SELECT query hangs

On my server I have 6 MySQL databases. They all power Wordpress websites. For some reason, 2 of these databases are not accessible. To my knowledge they use INNODB, but I can't confirm it as even ...
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2answers
476 views

linux server hangs after “running local boot scripts”

after a sudden electricity break down one of the company servers (ubuntu) hangs at boot. I have an OK message for "running local boot scripts (/etc/rc.local)" but it freeze there and a black screep ...
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51 views

GNU/Linux: nfsd will not die

I have a server that will not export NFS. It seems nfsd is hanging. So in an attempt to restart it, I tried to kill nfsd: # ps aux |grep '\[nfsd\]' | wc -l 8 # killall -9 nfsd # ps aux |grep ...
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1answer
966 views

Tomcat is closing randomly

We are using Tomcat 7.0.21 for production. Server is hanging randomly for last week. It creates files like hs_err_pid4528.log under bin folder. There are two parts in logs. JRE version: 7.0_21-b11 ...
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469 views

CentOS stopped loading after I added something to /etc/rc.d/rc.local

I am very new in Linux (first day). I needed to add my program to the OS startup. I could not find a solution, so I tried to do something that could solve my issue. I added my line of text ...
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1answer
435 views

SmartOS reboots spontaneously

I run a SmartOS system on a Hetzner EX4S (Intel Core i7-2600, 32G RAM, 2x3Tb SATA HDD). There are six virtual machines on the host: [root@10-bf-48-7f-e7-03 ~]# vmadm list UUID ...
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1answer
274 views

Why does my linux Server hang on reboot?

I have installed ubuntu server on an HP G7 machine which is brand new. Here is a picture of the frozen screen For some reason when I rebooted from my office it got stuck at the screen above, ...
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2k views

apache hangs frequently with semop

My Apache hangs frequently with multiple threads. Each process get stucked for hours. Backtrace looks like this: (gdb) backtrace #0 0x00002af60c22b2d7 in semop () from /lib64/libc.so.6 #1 ...
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3answers
850 views

Debian Linux server hangs after a week or so

I have 2 Debian Linux 6.0.4 servers that have a strange behaviour: after 5-7-10 days they hang. By this I mean the servers need to be restarted and before that ping won't answer. I've been struggling ...
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3answers
796 views

MySQL on ubuntu very high IOWAIT

Can anyone advice what is going on with my setup. I have mysql server on ubuntu which periodically produce very high iowait. for long time up to 10-20 minutes. During this time system and database ...
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2answers
690 views

After applying patches and rebooting, RHEL 5.3 hangs on udev

I suspect that one of the packages in the last system updated is causing problems with the system rebooting. When I reboot, the server hangs on udev. Here are a list of the updates that preceeded ...
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My MS AD server hangs without any information

At Random times my Microsoft AD Server gets totally frozen (but i can see that the cursor moves freely and num lock status is also fine but on the screen i dont see anything other than the ...
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2answers
1k views

ssh initial prompt hangs for 10 minutes but console login and initial prompt is very responsive - why?

I have been running an ESXi 4.0 server for months with a couple of WinServer2003 and several Ubuntu Server 10.4 VMs. The performance has been impressive on 6GB i7 Asus P6T hardware. Suddenly, a week ...
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370 views

JVM hangs with 100 IO wait on Ubuntu Maverick (AWS EC2 xlarge instance)

Have an xlarge instance in AWS running 9 Tomcats with heaps from 256M to 4G. With Ubuntu 10.04 the box sporadically hangs for a few hours with huge run queue (30-40), and nothing on CPU, then ...
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3answers
1k views

Dell PowerEdge 2950 III running XenServer with 2 VMs gets sluggish after a week and needs rebooted?

It has weird hangs and then random CPU spikes that do a ton at once. While remoted into the VMs I get an update all at once then it hangs for another 20 seconds. When it lets it go through I get a CPU ...
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1answer
307 views

MySQL queries hang site

I recently moved from a Dreamhost shared hosting account to a Linode 512mb VPS. The switch has been rather smooth for normal day to day operation of my site but some problems with MySQL have cropped ...
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1answer
489 views

Apache forks a very high number of threads, and hangs

We have moved one of our sites to a new server, which once in a while completely hangs. At first this happened very rarely, maybe once per month, but now it's starting to happen every day. By hangs, I ...
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4answers
920 views

apache2 + mod_fastcgi + suexec + php5.2 = unstable on high load

I am hosting several (~30) different sites on one server with apache2+fastcgi+suexec+php5. Sites have different loads and different execution times of their scripts (some of them process request for ...
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5answers
4k views

Every single time I use sudo it hangs before completing

Whether I get prompted for a password or not, it hangs between accepting the authentication and executing what I asked for. E.G. sudo ls will hang for about 60 seconds. I'm confused about what might ...
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3answers
125 views

Strange network behaviour on XP

I have a workstation which suddenly hangs the applications working over shared resources. But not for other TCP connections. For instance, I open windows explorer and browse on Z:\documents. Also I ...