Questions tagged [troubleshooting]

Troubleshooting is a form of problem solving, often applied to repair failed products or processes.

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Bind9 recursive queries have intermittent very long response times

I'm running BIND 9.8.1-P1 caching server on Ubuntu 12.04 LTS on kernel 3.2.0-86-generic-pae. I've been banging my head against the wall trying to figure this out for weeks and I just have no idea ...
Brian LaPan's user avatar
2 votes
3 answers
6k views

80% memory utilization on server- is this just caching?

Memory utilization is very high on this 2008 R2 server, but I think it might just be caching RAM- performance on the server is fine and CPU utilization is very low. It is running DFSR which I believe ...
red888's user avatar
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0 votes
0 answers
558 views

Can ping but can't RDP or access UNC path ofter reboot Server 2008 R2

I rebooted a server after a Symantec installation. I did this from home and have no way to physically connect. Rebooted the server and now I cannot access it from UNC path or RDP. Using a VPN to ...
wranks's user avatar
  • 3
0 votes
0 answers
40 views

HP P4014n will only print letter size

Had a user using HP P4014n locally, device suddenly stopped printing, I removed the printer, and uninstalled and reinstalled the printer drivers. Then readded printer. Now it will not auto-detect ...
rtyner's user avatar
  • 13
-1 votes
1 answer
1k views

IPv6 connections from outside the LAN are timing out; what is blocking the connection?

as I understand with ipv6 there is no NAT so every client on a network will get a different public ip address (so there is no need for port forwarding). so I checked on my network and indeed every ...
Timothy Werquin's user avatar
0 votes
1 answer
68 views

How to find Certificate signing request information?

I need to update certificates for the Apache servers (Linux Servers RHEL6) and it appears our team doesn't know the correct information for the CSR. Is there a way to find the correct information ...
user67186's user avatar
  • 115
1 vote
1 answer
1k views

Redhat Satellite 5.5.0 Remote Command Setup issue

I have setup Remote Commands on Redhat Satellite version 5.5.0 and trying to understand how the schedule works. The Remote Commands are already working on the clients but it appears that when we try ...
user67186's user avatar
  • 115
0 votes
1 answer
267 views

Open VPN troubleshooting

I'm trying to set up a site-to-site VPN connection between 2 of our offices. The VPN servers i'm using are 2 "Edgerouter lite" and the tunneling software i'm using is OpenVPN. This is how the setup ...
Jack Pettersson's user avatar
0 votes
1 answer
1k views

VPS can ping host by IP but not by name

My Debian VPS can ping all host by name and IP but there's one host I can't ping by name. Ping by name failed but successful with IP However on my home PC i can ping that host by name and IP. I ...
sg552's user avatar
  • 409
0 votes
0 answers
91 views

Network services abruptly stop working on win server 2k8

One of our windows servers has started acting up. All network services from roles on the server just stop working all of a sudden, untill the server is restarted. the issue occurs every other week or ...
Jack Pettersson's user avatar
42 votes
8 answers
90k views

High CPU utilization but low load average

We are running into a strange behavior where we see high CPU utilization but quite low load average. The behavior is best illustrated by the following graphs from our monitoring system. At about 11:...
K Erlandsson's user avatar
1 vote
1 answer
2k views

How to troubleshoot internet unreachable periodically through firewall

Periodically the internet is unreachable on my network, sometimes for 30+ minutes. After testing a direct connection to our modem, I realized this was not a problem with our ISP but the network itself....
Gabriel Syme's user avatar
2 votes
1 answer
57 views

iostat taking lot of time to return

I have a solaris 10 server with a lot of SAN disks (close to 1000 across all paths). iostat -En takes close to 5 min to return. Is there a way to figure out what is causing the delay? truss hasn't ...
sai garimella's user avatar
2 votes
2 answers
1k views

Linux RPC delete registration

there is a well-worked program (daemon) running on CentOS-5.4 that makes by itself RPC registration as program 191299 version 10. After an unplanned program stop, the RPC registration is still ...
user2606627's user avatar
1 vote
1 answer
117 views

ESXi host halts, console seems responsive but

... as soon as I enter a user name and password, it freezes. Won't let me hit "enter" to log in. Management ports are not responding, guest OS's are not responding. It did this once last week after ...
Jeremy Holovacs's user avatar
2 votes
0 answers
739 views

NGINX using 100% of the server CPU when testing with Blitz.io

I'm facing an issue here and after four days of looking around I decided to ask for some help here, after all a million heads can think a lot better than one. I have a Ubuntu 14.04 server setup with ...
Julian Fernandes's user avatar
4 votes
1 answer
3k views

windows update - strange behaviour using up all CPU

I have a windows 2008R2 server which has had windows update go mad. Last night it started pegging the CPU @ 100% and using 1GB RAM. Killing the Windows Update service took the CPU and MEM back to ...
Andrew's user avatar
  • 49
1 vote
2 answers
1k views

Best way to trace outgoing requests from a server

We have an Ubuntu 14.04.1 LTS server with nginx 1.4.6 that hosts a few dozen websites and received an abuse complaint from another server of hundreds of requests like this: "POST /wp-login.php HTTP/1....
Craig's user avatar
  • 289
0 votes
1 answer
1k 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 ...
Rasmus's user avatar
  • 9
13 votes
8 answers
71k views

Program does not run properly as Scheduled Task

Situation I have a batch script that prepares some files, executes a program (.exe) and then deletes said files. This task should run hourly, so I'm trying to configure this using Scheduled Tasks. ...
MarioDS's user avatar
  • 223
1 vote
2 answers
12k views

MySQL server hangs without reason

I have a server running web site with back-end database MySQL (more specific - 5.5.37-MariaDB, for debian-linux-gnu on x86_64). Sometimes it stops accepting connections and web site scripts report "...
Ralfeus's user avatar
  • 121
0 votes
1 answer
710 views

how to find cause of io spike

Everyday at around the same time, the IO usage on the server where our mysql slave goes up to 100%. I have setup a script that takes IO information every five minutes so I can find out why this ...
simao's user avatar
  • 151
0 votes
2 answers
3k views

Remote port forwarding through EC2 not working, though address is in use

I have a remote machine running a server which I'd like access to locally. However, I can only SSH into the machine, not use any other ports. I booted up an Amazon EC2 instances and opened all its ...
Claudiu's user avatar
  • 1,207
1 vote
1 answer
17k views

Troubleshooting blocked/dropped ports on Sonicwall firewalls

Short of enabling packet capture/monitor on specific rules/policies, is there an easier way to see or to setup a Sonicwall to show blocked ports/services (realtime or as a report)? I think packet ...
Alex's user avatar
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0 votes
1 answer
456 views

How to perform an assessment of an existing network? [closed]

I work as an IT guy for a small company with 2 offices. Currently we are in the process of moving our entire network infrastructure to a different host because we are running everything on extremely ...
user3361043's user avatar
2 votes
1 answer
7k 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 ...
db_ch's user avatar
  • 658
3 votes
3 answers
17k views

Windows Search Indexer Uses High CPU Usage

We have a Windows Server 2012. From time to time the Windows Indexer has too high CPU usage. What could cause this and how could it be solved. It runs perfect several weeks and then it takes too much ...
Matthias's user avatar
2 votes
1 answer
926 views

Errors when installing rootsh on Ubuntu

I'm installing rootsh 1.5.3 on Ubuntu 10.04 LTS (following this guide) and I get: $ make && make install Making all in src make[1]: Entering directory `/tmp/rootsh-1.5.3/src' make all-am ...
Sfisioza's user avatar
  • 592
2 votes
1 answer
207 views

Non-invasive way for our network team to run ping/tracert/etc from various servers

In troubleshooting connectivity issues, our network team lacks the rights on our servers (Windows and RHEL) to connect and test connectivity (for example, when tweaking a firewall rule, a ticket ...
SqlRyan's user avatar
  • 916
0 votes
1 answer
873 views

Frame-Relay Direct Serial, can't ping

I am working on my packet tracer lab. I have a bit long or series of questions but may be short answers can solve my problem. I am using 3 routers. all connected to each other using serial cable. R1 ...
Ahmed's user avatar
  • 1
0 votes
1 answer
1k views

Can't boot VM after P2V or ghost - Linux 2.6

I got this old machine that runs on a p2 400 and a Linux Debian 3.1 with kernel 2.6.8 and since it has modified binaries due to internal undocumented changes in the code, migrating off manually isn't ...
vn.'s user avatar
  • 375
0 votes
0 answers
322 views

Remote SQL Server Connection works from SSMS but not from Application

We are troubleshooting a weird issue with our SQL Server 2008 server. The application server runs a windows service that makes a DB connection via a connection string in its config file, and we end ...
tresstylez's user avatar
1 vote
1 answer
2k views

Determine cause of connection refused on surveillance video unit

We have 3 similar surveillance video units. Each has a server that should be available on ports 80 and 443. One unit has suddenly become unavailable on port 80, and I'm working to determine what could ...
Paul S.'s user avatar
  • 153
0 votes
2 answers
423 views

How to troubleshoot network from customers perspective?

We have a web application that we host that is customized for multiple customers. Each customer accesses their version of the site via their own custom subdomain. We are running into an issue where ...
tresstylez's user avatar
2 votes
1 answer
328 views

server hangs randomly without log entries

My physical server hangs randomly and I do not get any log entries during that time. So I let a script run: while true; do date >>/tmp/dates; sleep 1; done & disown After some minutes the ...
Thorsten Staerk's user avatar
0 votes
1 answer
2k views

MySQL 5.0 not logging aborted connections in general log

I know there is a bug in MySQL 5.0 which prevents aborted connections from being logged in the error log (http://bugs.mysql.com/bug.php?id=24761). However, aborted connections should still be logged ...
blizz's user avatar
  • 1,154
1 vote
1 answer
166 views

Advice on web server performance troubleshooting is needed

I'm renting a virtual CentOS based server where I have about 5 active sites running. Several months ago I noticed a significant performance degradation in how my sites are running. First symptom was ...
Alexey's user avatar
  • 11
2 votes
0 answers
2k views

How to prevent Windows Server 2008 R2 from automatically shutting down applications?

I have been running various processes over night on a Windows 2008 R2 AMD64 SP1 virtual server share via a VPN connection and remote desktop. Recently, I have been noticing that when I return in the ...
Borealis's user avatar
  • 155
0 votes
2 answers
1k views

How can I find out what Zimbra process (specifically "b") is doing?

My Zimbra mail server (8.0.2 Community Edition) recently started to spawn an interesting process called "b". top - 11:04:44 up 19 days, 18:47, 1 user, load average: 6.25, 6.38, 5.57 Tasks: 131 ...
Cninroh's user avatar
  • 268
0 votes
2 answers
2k views

How do you troubleshoot a PPTP+VPN+RDP freeze-up?

The symptoms are: I am at home. I am trying to dial a PPTP VPN. It connects fine. Pinging from command line in windows shows about a 30% ping success rate when the PPTP vpn is up, 100% ping success ...
Warren P's user avatar
  • 1,195
2 votes
0 answers
1k views

How to troubleshoot occasional Apache 500 errors?

I have GET and POST requests, both HTTP 1.0 and 1.1, to diverse URLs, mostly running Wordpress(1), which occasionally fail with a 500(2). No user has ever encountered a 500 themselves, nor have ...
Gaia's user avatar
  • 1,895
3 votes
1 answer
82 views

Virtual Server HDD shrinks without apparent reason

We have a virtual hosted Linux server, and in the last few months every now and then the HDD shrinks from 400GB down to the exact byte count that is in use. All existing data can be downloaded and ...
Christian's user avatar
  • 209
0 votes
1 answer
5k views

Why my 2nd ip from traceroute is not answering the ping anymore? [closed]

My Internet is really laggy today, I did a tracerout and I realize that I'm having no answer from an ip at the beginning of the traceroute. see: Tracing route to 12.129.202.154 over a maximum of 30 ...
Pedro77's user avatar
  • 103
-3 votes
2 answers
8k views

Port in Public IP can't be accessed [closed]

I have a local ip (xxx.xxx.xxx.xxx) and also a public ip (yyy.yyy.yyy.yyy) for my local server. I host a website in the local server on port 5555. I can open my website from the local ip (http://xxx....
Anthony Steven's user avatar
0 votes
1 answer
45 views

temporary hang with remote shells keeping the connection

We are having some trouble on our machine having Red Hat 6.2 Enterprise. For just about 1 minute this is what happens: during that minute my SSH shell are frozen and we cannot do anything at the end ...
Abruzzo Forte e Gentile's user avatar
11 votes
1 answer
5k views

Harddisks falling offline for unknown reason

I have 7 systems running the setup below. Now and then a different disk falls offline, but on closer inspection the disk is good and not faulty and works flawlessly for at least another year. Since ...
Ole Tange's user avatar
  • 3,106
1 vote
1 answer
377 views

Cisco ASA: Terrible network speed once or twice a day, fine otherwise

I've been trying to get to the bottom of this for a while now and, well, it seems like I can't. We have two servers behind an ASA5505 (software version 8.3) at a datacenter. They run a wide variety of ...
kshade's user avatar
  • 65
1 vote
1 answer
6k views

How can i find out why my web server is refusing traffic from my web proxy?

I have a bit of an odd problem that I can't seem to figure out. I will preface this question with the fact that this exact setup was working just fine, and for some reason has stopped working properly....
DKNUCKLES's user avatar
  • 4,028
3 votes
1 answer
5k views

iptables FORWARD port to internal server

I've been struggling with a FORWARD policy that isn't working the way I'd like, and I can't figure out what is causing the session to fail. I hope someone can help. My goal is to forward port 3000 ...
Jonathan Almquist's user avatar
-4 votes
3 answers
142 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 ...
abc123's user avatar
  • 107

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