Questions tagged [troubleshooting]
Troubleshooting is a form of problem solving, often applied to repair failed products or processes.
359
questions
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1
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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 ...
2
votes
3
answers
6k
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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 ...
0
votes
0
answers
558
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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 ...
0
votes
0
answers
40
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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 ...
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1
answer
1k
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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 ...
0
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1
answer
68
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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 ...
1
vote
1
answer
1k
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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 ...
0
votes
1
answer
267
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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 ...
0
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1
answer
1k
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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 ...
0
votes
0
answers
91
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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 ...
42
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8
answers
90k
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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:...
1
vote
1
answer
2k
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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....
2
votes
1
answer
57
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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 ...
2
votes
2
answers
1k
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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 ...
1
vote
1
answer
117
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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 ...
2
votes
0
answers
739
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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 ...
4
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1
answer
3k
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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 ...
1
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2
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1k
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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....
0
votes
1
answer
1k
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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 ...
13
votes
8
answers
71k
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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. ...
1
vote
2
answers
12k
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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 "...
0
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1
answer
710
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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 ...
0
votes
2
answers
3k
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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 ...
1
vote
1
answer
17k
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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 ...
0
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1
answer
456
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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 ...
2
votes
1
answer
7k
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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 ...
3
votes
3
answers
17k
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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 ...
2
votes
1
answer
926
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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
...
2
votes
1
answer
207
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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 ...
0
votes
1
answer
873
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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 ...
0
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1
answer
1k
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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 ...
0
votes
0
answers
322
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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 ...
1
vote
1
answer
2k
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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 ...
0
votes
2
answers
423
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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 ...
2
votes
1
answer
328
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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 ...
0
votes
1
answer
2k
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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 ...
1
vote
1
answer
166
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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 ...
2
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0
answers
2k
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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 ...
0
votes
2
answers
1k
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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 ...
0
votes
2
answers
2k
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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 ...
2
votes
0
answers
1k
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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 ...
3
votes
1
answer
82
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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 ...
0
votes
1
answer
5k
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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 ...
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2
answers
8k
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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....
0
votes
1
answer
45
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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 ...
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 ...
1
vote
1
answer
377
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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 ...
1
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1
answer
6k
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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....
3
votes
1
answer
5k
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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 ...
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3
answers
142
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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 ...