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

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Windows “net use” command throwing error, “System error 1909 has occurred” [duplicate]

What is the likely cause of this, if the command is run on Windows Server 2008? It appears that this account is an administrator on this box. I'm running the Windows command line as an administrator ...
2
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2answers
181 views

How do I find where packets are coming from that are being blocked by an ACL?

I have an ACL to prevent regular workstations from accessing the management vlan on our switch. Every 5 minutes we get the following log entry: %SEC-6-IPACCESSLOGS: list mgtvlan-acl denied 0.0.0.0 ...
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4answers
3k views

How to use kdump/crash to investigate an OOM issue?

The problem A server crashed after multiple "Out of memory" messages and I am trying to pinpoint the culprit. If it is in userland - which process. If it is in the kernel - which kernel module. ...
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4answers
2k views

IBM Xseries 3400 only working while power button holding pressed

I have an IBM xSeries x3400 Intel Xeon server which only works while someone holds in the power button. My server stopped working and I sent it to IBM Service. After a few hours they told me I could ...
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1answer
346 views

Windows Server 2008 Troubleshooting: Server falling over on a timely basis [closed]

All, This is a generic question, and I know it will upset some people, for which I apologise. I have recently taken a new role, and part of that role involves some sysadmin for Windows 2008 Servers ...
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2answers
3k views

How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?

I'd like to change IRQ SMP affinity for reasons, outlined in this question: CPU0 is swamped with eth1 interrupts But I can't — I see Input/output error when I try to write to ...
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2answers
130 views

unexpected server power off

Once or twice per day I find a server I have powered off with no apparent reason. Info and what I've done until now: Nothing is being reported under /var/log/. Just normal server activity and then ...
2
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1answer
293 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
293 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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0answers
228 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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1answer
273 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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4answers
998 views

Server freeze - how to debug

I am running a Debian virtual server with Apache, PHP, MySQL. There is just 1 website with very low traffic running but the server very often (almost everyday) freezes and does not respond. When ...
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1answer
1k views

Troubleshooting Windows Server 2012 storage spaces

I'm trying the new "Storage Pools" feature on Windows Server 2012, and I've created several disks on the pool. When I restart the server, some of the disks (two, out of four) do not attach ...
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1answer
187 views

How can I easily test connectivity to external sources with WinHTTP?

I've got an server application that uses Winhttp to fetch information from an external source. Occasionally, I'll need to troubleshoot connectivity issues and I'd like an easy way to test connections ...
0
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1answer
223 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
288 views

What are some steps to trouble shoot denied HTTPS requests in IIS 7?

I'm hosting a site in IIS 7 that's using a wildcard certificate from RapidSSL. To date there's been no issues of people not being able to connect to the site with SSL. Now we have a client who can't ...
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1answer
120 views

ASP.NET error logging locations and troubleshooting

Say an ASP.NET website suddenly starts returning a 500 error code with a blank page (not serving the configured error document). Where might I find error reports and/or clues as to what is happening, ...
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1answer
1k views

Odd one-way ping issue that I can't wrap my head around

Long time lurker, but today I encountered an odd problem that will bug me until resolution :-) It seems to be presenting as a one-way ping issue from one server to a failover cluster. All machines ...
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2answers
11k views

Troubleshooting Windows EAP/RADIUS connectivity issues

So, I guess the short version of the question is: I'm unable to get clients to connect to an enterprise-WPA wireless network after setting up a "new" NPS server and a new CA. After I manually ...
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2answers
166 views

Server unresponsive, messages shown on console but not in log files

I'm using Ubuntu Server 10.04.4, and once in a while the server hangs (once a month) and is totally unresponsive. The tty is flooded with messages like these. The problem is that these messages are ...
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1answer
2k views

“Device not ready” on a network share in Windows 7

I have two computers C1 and C2 runing Windows 7 and both of them are members in a domain. On C1 I have an USB hard-disk which I shared for the users U1 and U2 giving them Read-Only permissions on the ...
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1answer
54 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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3answers
20k views

How to investigate unexpected Linux server shut down?

In a new Xeon 55XX server with 4xSSD at raid 10 with Debian 6, I have experienced 2 random shut downs within two weeks after the server being built. Looking at bandwidth logs before shut down does not ...
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0answers
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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
762 views

alfresco, tomcat crashes on startup, no clues in the logs

I have installed an alfresco community edition 4.0 on a Win 2003 R2 with 3GB of RAM. I've used alfresco for some hours, i've created a user, uploaded some documents. But now, restarting it, tomcat ...
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2answers
3k views

Troubleshooting strategy for very poor iSCSI/NFS performance

We have a new Synology RS3412RPxs that offers iSCSI targets to three Windows 2008 R2 boxes and NFS to one OpenBSD 5.0 box. Logging into the RS3412 with ssh and reading/writing both small files and ...
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3answers
184 views

What could cause two devices to refuse to link?

This is a curious case where all the devices at hand will link with one another, except for two that just won't detect one another. One device is a single board computer (SBC) with a gigabit nic, the ...
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2answers
2k views

Troubleshooting ESXi hardware freeze with PCI Passthrough

I have a Supermicro X9SCM board with a Atheros AR5008 PCI Express card (D-LINK DWA-556, Device=0024&Vendor=168C). The card can successfully be marked for PCI passthrough in ESXi (I tried versions ...
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2answers
138 views

Server keeps crashing [closed]

I just recently rented a new server which is being used for hosting files and converting them. however for some reason the server keeps crashing every few hours, how can I find out the reason why my ...
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3answers
236 views

How to verify DNS change is active

I have DNS service from a third party, which provides an webapp for changing the DNS. I changed the DNS settings to point one of the domains I control to our new IP, but it's been hours and there was ...
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1answer
46 views

PC Shutting Down Without Warning [closed]

I have a Windows 7 PC that is shutting down without warning, seemingly at random. Here are the symptoms and notes: PC seemingly turns off completely. After taking off the cover it turns out the ...
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1answer
932 views

Fortinet: Is there any equivalent of the ASA's packet-tracer command?

I would like to know if there is not Fortigates an equivalent of the packet-tracer command that we can find on the ASA. Here is an example of execution for those who don't know it: NAT and pass : ...
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1answer
84 views

what tool to remotely diagnose server connections issues for multi-location, multi-platform, varying competency end users?

(you might intuitively think that this is a desktop type question, however I intend to use this network of clients effectively as monitoring agents for the servers, hence its relevancy to server ...
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1answer
921 views

WHEN does IIS 6.0 Application Pool CRASH with memory issues?

We've been having Out of Memory issues with our mixed classic ASP/.NET site for quite some time. Basically, we see a couple of different cases: Some request (SQL query that returns a LARGE ...
0
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1answer
272 views

Cisco 878 Router Physical Layer troubleshooting

My problem: Upon connecting the FastEthernet0 with a straight-through cable to a Catalyst switch, the line protocol comes up briefly and then goes down. Interface goes down too, I now have this on my ...
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0answers
225 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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1answer
3k views

What factors can disrupt a VSAT connection?

In some locations, the only option for an internet connection is to use some form of Satellite dish. Like any wireless medium these can be quite tricky to troubleshoot. What factors have you ...
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1answer
157 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
530 views

Can't update SQL Server 2008 to SP3, it only offers the option to create a new instance

A colleague is attempting to update our server's SQL Server 2008 version 10.0.1600.22 (not R2) install up to SP3. Unfortunately, we can't work out where the "Update" button is; the installer seems to ...
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0answers
516 views

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

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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3answers
252 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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1answer
537 views

How to check http errors with Windows 2008 Server?

This is the best I can describe my problem... I am running a search engine scraper essentially on Windows 2008 Server. Constantly accessing millions of random domain names and following their links ...
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2answers
239 views

how do I troubleshoot rdp

I have one Windows XP SP3 pc on the domain that I cannot rdp into. The xp pc is enabled for rdp sessions. Port 3389 is open in the firewall. There are no errors in the event logs. I have tried to rdp ...
2
votes
1answer
71 views

When troubleshooting a complex issue is there a reason to go with an additive vs subtractive troubleshooting methodology

TLDR: I am interested in finding out whether there is a reason to select an additive approach to troubleshooting over a subtractive approach, or vice-versa when trying to troubleshoot a problem with ...
0
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1answer
76 views

Internal e-mails

We need to send mails from our domain (assume this is example.com) to our self. Now, the 'incoming' mails are handled by another server (from Google). We can send mails through sendmail to external ...
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2answers
2k views

Putty + Bash + Screen, up arrow for history not working (Ubuntu 11.10)

I have a fresh install of Ubuntu Server 11.10 that I am logging into SSH via PuTTy. When I am inside screen, I cannot use the up arrow to recall bash history (though this works outside of screen). I ...
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2answers
198 views

How to troubleshoot many failed pageloads?

I've had a few cases in which the homepage of one of my sites wouldn't load in the browser. The site is running on django/fastcgi/nginx. It was difficult to reproduce so, in an attempt to understand ...
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1answer
170 views

Troubleshooting potential compromised server from Brute Force SSH Attack [duplicate]

Possible Duplicate: My server's been hacked EMERGENCY So I noticed some files/folders on my webserver and investigating leads the fact that a brute force attack via SSH was done on my ...
0
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1answer
101 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
669 views

Trying to bridge NIC. What does this error mean?

I would like to bridge between br0 and tap0 for my OpenVPN server, but I get the error at the bottom of this post. Background The server have one physical eth0 with IP xxx.xxx.68.58. The bridge ...