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

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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
796 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
6k 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
137 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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107 views

No video signal and server shuts down

I have a brand new server. The motherboard is Intel S2600CP4, two 8-core Intel E5-2600 processors. RAM is 8 DIMM slots of 8 GB each (KVR1600D3D4R11SK4/32GI, I installed them into the blue slots), ...
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153 views

Why would one server be sending DUP ACK packets to one PC, which is responding with HTTP RST packets?

I'm not a network profressional, so please excuse any wrong language. I was debugging why my DNS traffic was a constant 160Kbps on our corporate network. I opened up a wireshark trace, and I see one ...
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1answer
1k 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
12k 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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172 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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512 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
2k 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
168 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
1k 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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124 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
216 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
44 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
636 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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179 views

Hight Threads in the LAMP server. Troubleshooting

So I was wondering around the web, and cant seem to find any decent Treads trouble shooting guide. Ans at the same time my server spiked yo 3k threads. So maybe someone could give me some tips, or ...
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1answer
75 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
640 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 ...
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1answer
243 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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106 views

CISCO - Configuring Application Inspection (Fixup) How to do it for SMTP?

We are getting error in EHLO Command from outside the Router and We are getting 220 ******* kind of message instead of welcome message which is configured in the Mail Server. many suggesting its a ...
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194 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
2k 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
144 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
393 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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426 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
215 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
414 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
228 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 ...
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1answer
69 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 ...
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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
1k 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
169 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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151 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 ...
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97 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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573 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 ...
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1answer
514 views

Troubleshooting Nagios alerts; aka. Why aren't my alerts firing?

I'm attempting to add email alerts to an existing Nagios install. I've been using the web interface to keep an eye on some non-critical systems for a few months and it's been running well; warnings ...
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3answers
102 views

Ubuntu 10.04 install is missing /etc/rc0.d, is there a quickfix?

I have no idea how this happened, but /etc/rc.*/ is simply missing. As a result, aptitude and apt-get don't work right anymore. Is there a quick-fix for this? I really don't want to reinstall the OS ...
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3answers
822 views

Performing root-cause analysis

I want to learn more about how to perform root-cause analysis. More times than not, our department tells the user to try rebooting (thier Windows XP system), which actually "fixes" a good number of ...
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1answer
88 views

Proxy-Connection Header associated with failed connections

I work with microprocessor devices that have/run a micro webserver. I have two of these devices set up so that they can be accessible to/by the Internet - I'll call the devices "A" and "B". ...
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1answer
144 views

End-user SSL certificate management workflow

We have an internal website, served from behind HTTPS with client certificates. Website users are non-technical persons, working remotely. They use Windows (XP, Vista, 7) and OS X (10.5, 10.6, 10.7). ...
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4answers
287 views

Ubuntu troubleshooting

I have a computer which keeps becoming unreachable, and a restart fixes the problem. It's under somewhat heavy load (high cpu, and high ram usage), but appears for the most part stable. What's a good ...
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2answers
844 views

Server is rebooting unexpectedly, strange kernel messages in log file

I have a server running Ubuntu 10.04 that is rebooting several times a day it seems, and I can't figure out why. It doesn't appear to be a graceful reboot either, because some of the services complain ...
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2answers
1k views

SSH closes connection when key is accepted

In server's auth.log: Failed publickey for agladysh from MYIP port 61313 ssh2 In ssh -vvv: debug1: Offering public key: /Users/agladysh/.ssh/id_rsa debug3: send_pubkey_test debug2: we sent a ...
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1answer
70 views

LAN - troubleshooting

I have 2 clients on my LAN that I'm trying to get to "see" each other. The first as follows Computer1 IP 172.21.62.230 Subnet 255.255.255.224 Default gateway 172.21.62.225 Preferred DNS server ...
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2answers
318 views

Troubleshooting firewall and routing on Linux

Are there any tools or API hooks for troubleshooting iptables or routing on Linux? (besides the obvious -j LOG) In other words: what to do when tables with 200 or 300 firewalling rules after adding a ...
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1answer
109 views

VMWare Workstation connection problems

Our old setup (which worked): On workstation W-1 (WinXP - 64bit) we had two virtual machines (VMWare 6.5) V-1 and V-2 (both with WinXP-32). All of them had a different IP static address, V-1 and ...
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777 views

Juniper ssg 5 web UI not working

I am facing issue with my Juniper SSG 5. I tried to configure & enable web filtering in my office following various ways to do it on the web. Even with various permutations it is still not ...