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

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327 views

Application getting VERY slow only in the morning: tools to track the culprit?

I have two Ubuntu Servers: one acting as db server (mysql) and file server and the application server. Using this three service an application has been working flawlessly for months. Now we've found ...
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2answers
124 views

troubleshooting a printer problem

I have a large Kyocera Printer/Scanner/Copier machine in a office with three PCs (all plugged into a lan via router. The three PCs all have individual printers (inkJets) hooked directly via printer ...
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1answer
504 views

Machine with bonded interface does not receive multicast packets on all slave interfaces

After an upgrade of our machines from RHEL 6.6 to RHEL 6.7 we observed a problem where 4 of our 30 machines only receive multicast traffic on one of their two slave interfaces. It is unclear if the ...
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1answer
171 views

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 ...
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1answer
508 views

Measure Upload Speed between a client and our server

We host a SAAS application specially customized for multiple clients. For one customer in particular -- they are reporting sporadic performance issues from various locations on their network, in ...
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1answer
505 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 ...
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1answer
386 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 ...
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1answer
112 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 ...
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1answer
51 views

Troubleshoot DBMail in SQL Server 2005

On a SQL Server 2005 machine, I have DBMail setup and correctly configured. I am able to use "Notify Operator" and EXEC msdb.dbo.sp_send_dbmail to queue emails. But the problem is the queued mails ...
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1answer
400 views

How do I troubleshoot network connectivity problems in windows?

I'd really like to understand how to debug my network connectivity issues, but everything I find on the internet is either for basic users on "How to add a wireless network" or it's people talking ...
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1answer
30 views

Failure installing and running couchdb on Lubuntu

I'm trying to get started using CouchDB on a laptop where I recently installed Lubuntu (15.10). I'm having strange issues.. Yesterday, I installed CouchDB (sudo apt-get install couchdb) and it ran ...
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1answer
26 views

Server response not being received

I have a python program that sends requests via a socket connection to a local 3rd party application which in turn forwards my request to a server. The server response then makes it's way back to my ...
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1answer
256 views

Windows 7 (32-bit) Sysprep not running Unattend.XML but no error in logs

I am trying to Sysprep a Windows image that will run on identical hardware. The issue I'm facing is that the Unattend.XML file is somehow not running whatsoever, but the logs itself do not say ...
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1answer
34 views

Port forwarding https request to other server.

I've been asked to fix a issue but I did not configure this server so I could not figure out what's happening here.. www.mywebsite.com connects to 20.20.20.20 (Webserver) ...
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1answer
144 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 ...
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1answer
172 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 ...
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1answer
700 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 ...
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1answer
387 views

Troubleshoot IIS 6 and Intermittent SQL Server Connectivity Loss

I am not a System Administrator, but I am temporarily trying to fill that role. I have 2 Windows 2003 Servers. 1 server has my Microsoft SQL Database (SQL Server 2005) and the other is the web ...
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1answer
557 views

Diagnosing SAN connectivity issues (RHEL5)

We are currently utilizing GFS2 to share a SAN LUN between 3 servers. However due to a feature problem with vendor software we are using, we currently have the volume unmounted on two of the boxes, ...
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1answer
439 views

Windows Server 2008 R2 Troubleshooting PID Leaking

One of our servers has been leaking PID like crazy. I wrote a simple scheduled script, and it seems that every day the highest PID increases by approx. 300'000. E.g., if on Aug.24 00:00 the highest ...
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1answer
58 views

How to troubleshoot banned connections on OS X / Ubuntu

I have an ubuntu 11.10 VM running on an OSX machine. Every once in a while some services become inaccessible from specific IPs (e.g. sometimes just ssh is blocked, and sometimes both ssh and https.) ...
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1answer
165 views

What sort of network problems can a single NIC host cause?

A remote office has a Cisco ASA 5505 connecting the LAN to our HQ LAN via VPN. When a particular Windows XP PC is connected to the ASA via a switch, the VPN tunnel drops, and after a short while, all ...
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1answer
123 views

nginx redirecting for no reason?

This was really annoying and now i see when it happens. If <ip>/NAME exist in /var/www (/var/www/NAME) nginx will give me a redirect to www._.com/NAME/ (note the slash and lack of url) which is ...
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1answer
441 views

VMware server 2.0 SYN/ACK repeating issues

VMWare Server 2.0.0 Build 122956 I am having some issues with connecting into a guest VM (Ubuntu linux 4.4.3-4 lucid) running under VMware 2.0 on a windows server host. All connections to and from ...
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1answer
88 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 ...
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1answer
117 views

DNS oddities with different nameservers

My ISP's DNS servers are sometimes sketchy, so I use 4.2.2.1 and 8.8.8.8 respectively. The Layer 3 DNS server and Google's DNS server. Sometimes there will be a long delay in resolving, and if I ...
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0answers
211 views

Monit will not start my node js app

I have a problem with Monit that I use for monitoring of my Node.js app. I just moved from a single core machine to a multi core one. On both of them I run Ubuntu 11.10. On the old one this was ...
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0answers
71 views

Website inaccessible until host is pinged from client (on a class A subnet)

There is this really weird issue on the internal network, this happens constantly to "random" machines. Machine (client) boots up, goes to ...
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0answers
410 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 ...
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0answers
46 views

Sun X4150 not powering up via power button

What I have I have a Sun Server X4150 ( https://docs.oracle.com/cd/E19121-01/sf.x4150/820-1852-13/doradi-overview.html ) which I have set up in a research environment (I'm testing various OSs and ...
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0answers
1k 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 ...
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0answers
306 views

Apache taking up a lot of CPU while running request-tracker4

I am trying out a request-tracker installation on an EC2 micro instance. The specs for the micro instance are as follows 1) Ubuntu 12.04 64bit, 613MB RAM, 8GB Hard Drive 2) Running request-tracker ...
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0answers
305 views

How to troubleshoot intermittent winsock 10054 errors on Windows Server 2003 SP2

We are getting 10054 errors in a couple of our applications on one server running Windows Server 2003 SP2. This happens intermittently, and we also have other similar servers running the same ...
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0answers
734 views

Slow connection to a shared .mdb file over a LAN on some machines only

A single client program on each of about 10 computers are sharing a .mdb file on a windows 7 machine. The network is cabled and has a switch. For no obvious reason the connection on 2 of these ...
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0answers
5k views

ADFS 2.0 Errors Event ID 184 & 364

I have ADFS servers set up and each component such as in URN, relay, claims etc. in place, but am getting this error massage "There was a problem accessing the site. Try to browse to the site ...
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0answers
25 views

VoIP NAT to connect to companies of the same ip address range together

I am currently using packet tracer to configure the network for Company A. I have configured DHCP and telephony service successfully but the problem I'm facing is when company A tries to contact ...
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0answers
66 views

Cannot install Azure Backup Server / DPM

I am trying to install Microsoft Azure Backup Server software, which is basically a clone of DPM, on a Windows 2012 R2 Azure VM. For some reason every time I get to the agent registration portion of ...
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0answers
47 views

Netscreen VPN UP/DOWN due to loopback address source monitoring

I am dealing with a problem with Netscreen VPN. Topology is basically Server Side ーー> (Agg2)Trust/Untrust(Agg1)ーー> ーー> Remote Office (Yamaha) 100.66.xx.0/24 ーー> Netscreen VPN ーー> Internet ーー> ...
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67 views

Intermittent Network Instability

I have an office network being run by a Linksys WRT1900AC, and I'm experiencing significant, but intermittent issues. I have between 15 and 20 devices connected to it, including computers, phones, ...
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195 views

one or more threads of java.exe are waiting to finish network I/O windows 2012 server

I have installed jdk-8u45-windows-x64 on my windows 2012 server. I am seeing that in task manager java.exe is utilizing high CPU. I check he detail in task manager via right clicking on java.exe then ...
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283 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 ...
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0answers
19 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 ...
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68 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 ...
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0answers
477 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 ...
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0answers
117 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 ...
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0answers
696 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 ...
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206 views

Windows Server 2008 R2: Weekly network failure

Thought I would throw the question on here, as I'm not a seasoned sysadmin... Every Thursday (or there about) at no particular time, the server becomes unresponsive to its usual network operations ...