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

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4
votes
3answers
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 ...
2
votes
1answer
17 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 ...
1
vote
1answer
922 views

Maximum amount of memory per session with IIS/.NET

I'm troubleshooting some memory issues we're running into with a heavily used ASP.NET site hosted on IIS6. Intermittently we have to manually recycle our application pool (process) to resolve issues ...
5
votes
11answers
37k views

Unable to logoff, disconnect, or reset terminal server user in production environment

I'm looking for some ideas on how to disconnect, logoff, or reset a user's session in a 2008 Terminal Server (unable to login as the user either as it is completely locked-up). This is a production ...
66
votes
9answers
33k views

Environment variables of a running process on Unix?

This is to troubleshoot some problems related to environment variables .. On Windows, I could do this by using tool such as ProcessExplorer to select particular process and view values of each ...
1
vote
1answer
26 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 ...
2
votes
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 ...
1
vote
1answer
70 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 ...
1
vote
1answer
76 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 ...
3
votes
1answer
102 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 ...
1
vote
0answers
88 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 ...
1
vote
2answers
49 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 ...
-1
votes
1answer
50 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 ...
9
votes
5answers
2k 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. ...
1
vote
1answer
77 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 ...
0
votes
1answer
45 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 ...
0
votes
2answers
82 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 ...
0
votes
6answers
3k views

How to troubleshoot a black screen (no video) on boot?

On a related question to this one, now I have a file server whose power supply and fans spin up, but gets no video and no beep codes. I have tried two different video cards in the system, and neither ...
0
votes
0answers
68 views

Find cause of unresponsive Ubuntu 14.04 KVM host

I'm hoping someone can point me in the right direction on a very puzzling problem. I've got an older server running Ubuntu 14.04 that serves as a virtual host for some small virtual (KVM) machines. ...
0
votes
0answers
44 views

Troubleshooting mySQL load problems

SSD VPS with one Magento site on it. Recently whenever I make a save to a product, the mysql QPS skyrockets and server load goes up tenfold for several minutes (even though the admin page loaded long ...
1
vote
1answer
629 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 ...
0
votes
2answers
1k 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 ...
0
votes
1answer
73 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 ...
0
votes
0answers
66 views

“Network name cannot be found” just on some shares

We had an Windows XP in a VMWare virtual machine joined to an Active Directory domain. DC servers are Win2008 and the workstations have static IP addresses. Because the HDD with that vm (called P2) ...
2
votes
1answer
859 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 ...
1
vote
1answer
110 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 ...
15
votes
3answers
26k views

What is the ibdata1 file in my /var/lib/mysql directory?

Logging in to my Webmin control panel, I noticed that virtually all of my disk space is full. I searched for the ten largest files/ directories on my system and found that a file called ibdata1 is ...
2
votes
1answer
78 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 ...
0
votes
1answer
95 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 ...
4
votes
2answers
439 views

Troubleshooting apache redirects in production

How do you troubleshoot Apache redirects in production? I know there's a logging feature somewhere that lets you log all the redirects that happen...
0
votes
0answers
218 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 ...
0
votes
0answers
66 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 ...
2
votes
1answer
98 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 ...
1
vote
1answer
285 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 ...
0
votes
2answers
130 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 ...
3
votes
12answers
6k views

Citrix degrades with 100% CPU

We have a Citrix PS4.0 farm made up of 2 physical and 2 virtual Citrix servers. Any one of them at some point or another will eventually degrade in performance due to hitting 100% CPU usage. I can ...
2
votes
3answers
14k views

Best way to troubleshoot apache not starting?

We have recently gotten a backup server to mirror all our data onto in case the primary server goes down. I've gotten all the sites data updated through rsync, and all the apache config and databases ...
0
votes
1answer
323 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 ...
0
votes
2answers
988 views

Hyper-V Guests suddenly stopped working

Here's my configuration: Windows Server 2008 R2 Standard as a host OS, and two guests VMs running the same exact OS. Yesterday, Trial Activation on all OSes has expired and quite naturally all ...
1
vote
0answers
456 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 ...
0
votes
2answers
469 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 ...
0
votes
2answers
1k 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 ...
3
votes
5answers
2k views

Open ports broken from internal network [duplicate]

Quick summary: Forwarded port works from the outside world, but from the internal network using the external IP the connection is refused. This is a simplified situation to make the explanation ...
1
vote
2answers
3k views

Windows Server 2003 DCDiag error message “delegation is broken for foo.com.foo.com on dns server”

It started as a simple diagnostic: dcdiag /c when it ran it gave me the following error from the DNS portion of the DCDIAG test delegation is broken for foo.com.foo.com on dns server on dns ...
0
votes
0answers
340 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 ...
3
votes
1answer
63 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 ...
0
votes
1answer
370 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 ...
-4
votes
2answers
596 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 ...
0
votes
0answers
33 views

Switched google apps domains; now certain emails aren't delivered?

We recently moved from one google apps domain to another, and used Backupify to transfer email accounts, etc. Since then, we've had intermittent issues with customers not receiving emails or having ...
0
votes
0answers
51 views

Vserver CentOs 6.4

I have the following problem. I have a server based on CentOS 6.4 is running the Vserver. I did update the kernel to version 2.6.32.14. Unfortunately, after rebooting the server receives the "kernel ...