0
votes
0answers
40 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 ...
0
votes
2answers
76 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 ...
0
votes
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 ...
1
vote
1answer
149 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 ...
-3
votes
2answers
537 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
238 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 ...
3
votes
3answers
174 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 ...
0
votes
0answers
96 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 ...
1
vote
0answers
39 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
votes
1answer
204 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 ...
3
votes
1answer
902 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 ...
0
votes
0answers
156 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 ...
0
votes
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.) ...
0
votes
1answer
79 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 ...
0
votes
1answer
150 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 ...
1
vote
0answers
458 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 ...
0
votes
1answer
603 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 ...
0
votes
1answer
90 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". ...
0
votes
1answer
120 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 ...
0
votes
1answer
506 views

High ping everywhere except one PC

I have a network with a really high ping (usually more than 500ms) except for one laptop. And in that laptop the ping is usually 5ms. I've tried: - using same model laptop - compare lan driver ...
1
vote
1answer
235 views

mac OS X version 10.6.5 network connection troubleshooting/solution?

Im connected to a small office network where where everything works fine. however once in a while or on a random occasion usually after the computer has been left on or on sleep all night there are ...
1
vote
1answer
3k views

What causes the issue (possibly packet loss) in this scenario

I'm trying to diagnose a network related problem - please understand these points before suggesting an answer (apologies if more information is required, I will add anything people ask). We have a ...
0
votes
1answer
543 views

Random Ubuntu server network disconnects

After installing Ubuntu Server 10.04.1 on a new x86_64 kvm instance (Debian 6.0 hosted) I'm getting -apparently- ramdon disconnects from the server. Read from remote host myserver: Connection ...
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 ...
0
votes
1answer
377 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 ...
0
votes
1answer
145 views

Ubuntu guest (virtual box) doesn't show on the router

I installed Ubuntu (as a virtual machine using virtual box) with the openssh server option and apache. When I do ps -ef | grep apache I see apache is running. But: I can't connect to the server ...
1
vote
1answer
604 views

Uneven load with Microsoft Network Load Balancing (Server 2003)

I am a network administrator at a small company that uses Network Load Balancing (NLB) to cluster our terminal servers together. Recently, we changed our network setup due to PCI-DSS compliance. ...
0
votes
2answers
1k views

VMware workstation 6.5 VMs (Host-only network with static ip address) cannot ping each other

I had specified Host-only network and disabled the dhcp server that comes with the Host-only network. I had setup the following network config, vm1 ip address: 192.168.147.2 netmask: 255.255.255.0 ...
1
vote
2answers
2k views

How can I capture traffic with tcpdump and a sliding window or sort of “logrotate”?

I want to capture some traffic with tcpdump for troubleshooting. The problem is, the error is not reproducible. To not fill up the hole disks with captures, I would like to capture the traffic with ...
10
votes
7answers
9k views

Troubleshooting a “slow” network

We've all had a complaint that the "network" is "slow" at some point: might be localized to one room (switch) or one computer, might just be Internet (DNS? Browser issue?), might be just one ...
3
votes
2answers
1k views

Alternate Out of Order TCP Packets problem

I have a Windows network with embedded nodes connected to a series of Cisco switches. I have been seeing some serious network problems starting a few days ago. I used Wireshark to capture the network ...
0
votes
3answers
4k views

Troubleshooting a network interruption

My company is pretty much entirely a Windows shop: Microsoft firewall, all Windows servers, etc etc. The hardware is mostly Cisco or Cisco-like. For about three weeks, we've experienced "random" ...
1
vote
2answers
88 views

http server connectivity puzzle

I have been seeing some strange connection issue in the production environment. The setup has two IBM Http Server's (IHS) and a network IP load-balancer in front of them (round-robin). One instance ...
0
votes
7answers
711 views

Good tools and approaches for diagnosing poor performance

My company is developing a web-based data viewer application which requires a fairly decent amount of bandwidth to function well. However recently we have been changing a lot of things. For example, ...
10
votes
6answers
16k views

Why was my ping answered by a different IP address than the one pinged?

While trying to setup a MSSQL clustering solution, I am running into a problem that is outside of my expertise that is related to networking. I was trying to find a free IP to used for my node. I ...
1
vote
3answers
4k views

Trouble setting up a DD-WRT router with a DSL gateway

Our office is fairly small. We previously had a 2wire gateway that came when we ordered our DSL connection. I recently decided to upgrade to a router that could support DD-WRT since the 2wire was very ...
2
votes
4answers
237 views

Diagnose Network Faults

Disclaimer: I am a developer, not a system admin, please be gentle. Where I work we are having a lot of intermittent network problems. Sometimes the DNS will fail, but access to servers can be done ...
0
votes
1answer
215 views

How can I troubleshoot error 10049?

We have an multi-tier application that lets our clients connect through the internet to us and have run into an interesting problem recently. From some client locations, User A will attempt to ...
0
votes
4answers
1k views

>40Hz DNS query xxx.1.168.192.in-addr.arpa, unknown cause

On one of my FC10 boxes I noticed that the network activity lights keep flashing even when I'm doing nothing on it so I pulled out wireshark and took a look at whats causing it. It's logging the same ...
3
votes
7answers
614 views

Wireless network signal strength troubleshooting… where to start?

Here is the information displayed by the wireless router (see end of post). The problem is that my netbook does not get any signals from the router if moved more than 3 feet (yup, three feet) away ...
1
vote
2answers
3k views

VMWare workstation 6.5 bridged networking stopped working

I have an XP client running on a Vista host. The client used to have bridged networking working fine, lately it stopped working for no aperant reason. Other kinds of networking works, though. It ...
1
vote
5answers
353 views

Is it realistic to remotely troubleshoot network issues?

I have a small non-profit that I help that has a hub and spoke fiber network on managed Netgear switches. They have both T1 & DSL connectivity, separated by VLAN's with a simple VoIP system ...
2
votes
2answers
236 views

What are the most important skill/knowldege sets for a network administrator to have to support VOIP?

As a network administrator (Cisco switches, work with WAN providers, protocol analysis) I have an "area of responsibility" for the customer's VOIP project. The telecom group has primary ...
0
votes
2answers
666 views

Why is my system constantly downloading from 255.255.255.255:bootps?

On my workstation I noticed that my network utilization is high and constant even though I don't have any downloads currently going. I fire up iftop and see the following entry at the top: ...
1
vote
4answers
268 views

Software for monitoring network speed and connectivity

I have been experiencing a lot of dropped connections between on all of my devices and it is really frustrasting..... Does anyone recommend free or reasonable price software to monitor signal ...
0
votes
4answers
126 views

Windows Network Connection has filled systray with many icons

I have a user that has a crazy amount of network connections populating his systray and he only has one network card and a wireless card. After a while he can hover over them and they will ...
1
vote
7answers
2k views

how do you troubleshoot network performance of a web application

This is a pretty naive question, I guess. I frequently need to figure out what if the problem with a web app or is it simply a networking issue - lost packets or a slow connection in any point ...
1
vote
3answers
1k views

Troubleshooting (or tracing) Windows network logon problems

I've got a situation where a client computer (Windows Vista) doesn't seem to be sending the right password to a server (Windows Server 2003). The event log records the logon failure, but as far as I ...
12
votes
4answers
310 views

How do you troubleshoot wireless woes?

Sometimes I have to troubleshoot machines on my LAN which have flaky wireless connections without any seemingly logical reason. Contrary to "normal" network connections in most cases I don't know ...