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

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1answer
10 views

How to troubleshooting wireless network issue with ip-network falling periodically?

All wireless clients some times a day can't see anybody in the network: no AP (ping or web-interface), no Internet-access, no each other, but Wi-Fi signal is ok for them. In the same time ...
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0answers
27 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
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1answer
39 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 ...
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0answers
33 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 ...
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1answer
25 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 ...
2
votes
1answer
52 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 ...
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1answer
44 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 ...
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0answers
143 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
54 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 ...
1
vote
1answer
99 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 ...
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2answers
93 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 ...
2
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1answer
84 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 ...
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1answer
144 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 ...
1
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1answer
48 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 ...
1
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0answers
128 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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votes
2answers
340 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
760 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 ...
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0answers
217 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
60 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
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1answer
178 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 ...
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2answers
324 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 ...
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0answers
30 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 ...
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0answers
43 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 ...
0
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1answer
33 views

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 ...
0
votes
1answer
38 views

Unable to connect to IDAQ database from php

I'm having difficulties migrating a site to the clients host. The host is idaq.com. I've searched for ages and have found no actual answer or even close to one. I'm using the following connection ...
11
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1answer
360 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 ...
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1answer
158 views

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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1answer
893 views

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 ...
0
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0answers
157 views

FreeBSD 7 syslog messages: “kernel: 15.xxxxxxxxxxxxxxx too long” (or “too short”)?

I'm experiencing poor performance on an old FreeBSD system and the only anomaly I see so far are syslog messages of the form: Jul 1 12:10:50 myserverXXX kernel: 16.0ccdd219377c0d80 too long Jul 1 ...
2
votes
1answer
870 views

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 ...
-4
votes
3answers
69 views

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 ...
-3
votes
2answers
591 views

Alternatives to wireshark? [closed]

What would be a good option to troubleshoot an interaction of browser with a server besides wireshark? I mean being able to see what the browser sends and receives. Is firebug a good alternative or is ...
4
votes
4answers
253 views

Troubleshooting wireless network in a 4000 square feet office

I work for a non-profit organization in a 4000 sf office with 30 staff. All laptops are connected to the network wirelessly. We have one switch (TP-Link TL-SF1008D Ethernet Switch) and three routers ...
2
votes
1answer
93 views

Is my server toast?

Last night I received an e-mail from mdadm about the possible failure of two drives on my array. The raid array was set up as a 4 2TB drive raid5 with one hot spare. Is this system truly fried? Did ...
-1
votes
1answer
379 views

DHCP Troubleshooting [closed]

I am working at a branch office and have been tasked with changing out the DHCP scope to match the overall corporate IP address scheme. The main office assigned me an IP address range of ...
3
votes
3answers
177 views

huge slowdown in network of 40 nodes when local DNS is up

We have a LAN with ~40 workstations (mostly Windows) and a couple of servers. All of them use an internal DNS (196.168.0.4 running BIND 9.5.0-P2) and a gateway (192.168.0.1 running OpenBSD Packet ...
1
vote
3answers
4k views

How do I identify unknown protocols on my Cisco 2811?

I have a misbehaving Cisco 2811. It serves our office of 20 with internet and phones via Call Manager Express. Except that lately the phones aren't working right and internet is choppy. The outside ...
12
votes
3answers
19k 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 ...
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0answers
104 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 ...
0
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1answer
7k views

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
votes
2answers
129 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 ...
9
votes
4answers
2k 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. ...
2
votes
4answers
1k 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
votes
1answer
286 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 ...
2
votes
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
125 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 ...
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0answers
40 views

Shared drives on network issue [closed]

I have over 6 computers that are not listed on a domain, just normal local logins. There is one computer which is called User-PC which has a RAID Array. We also have another computer called TV-PC ...
2
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1answer
232 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 ...
0
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1answer
250 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
208 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 ...