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26
votes
5answers
68k views

Why do we ping the IP 4.2.2.2 to test connectivity?

For as long as I can remember, I've always used the IP 4.2.2.2 when testing network connectivity using ping. What is significant about this IP, and when did this practice start?
14
votes
3answers
38k views

How to setup a MySql server to accept remote connections?

I am installing a MySql server in Ubuntu desktop. I could connect MySql Query Browser to it when specifying the Server Hostname as localhost, but when I replace it by the machine's IP it stops working ...
8
votes
4answers
2k views

Multi-WAN bonding across different media

I've recently been thinking again about a product that Viprinet provide, basically they've got a pair of routers, one that lives in a datacentre, Their VPN Multichannel Hub and the on-site hardware, ...
8
votes
1answer
252 views

Choosing Transit Providers

My organisation is in a position where we are paying quite excessive charges for single homed IP transit form our primary data centre provider. We're at the position now where we're ready to start ...
8
votes
1answer
386 views

Why do a few of my customers lose HTTP connectivity for brief periods?

I am running IIS 7.5 on Server 2008 R2 virtualized on a Windows Core 2008 R2 server on Intel server hardware sitting behind a Sonicwall firewall. For a number of months now, we've had a trickle of ...
7
votes
5answers
5k views

SQL Server Timeout on first attempt

I'm having a strange issue where I try to attach to SQL Server 2008 running on a second computer (both machines running Win7 64-bit), either through the Data Sources in Visual Studio or via the SQL ...
6
votes
4answers
18k views

Testing UDP port connectivity

I am trying to test whether I can get to a particular port on a remote server (both of which I have access to) through UDP. Both servers are internet facing. I am using netcat to have a certain port ...
6
votes
6answers
4k views

Remote desktop connection drops before login can appear

Someone asked this question a few months ago and I have the exact same problem. I have tried all of the suggested solutions in the other posting (in particular reinstalling the video card on the ...
5
votes
2answers
393 views

Embedded device configured with bad IP address, can I still connect?

We have an embedded device running Linux (2.6.?) that can no longer be accessed over Ethernet. Someone in the field gave this device the following bad settings to its ethernet interface: IP: ...
4
votes
4answers
2k views

Why do VPN connections break when I sleep my computer?

On the limited (Cisco) VPN systems that I've used, the VPN connectivity is broken when my computer is put to sleep and must be re-established on wakeup. Is this a necessary property of VPN?
4
votes
1answer
328 views

Two HP iLOs have gone unresponsive, and are in a colo. Is there any way to remotely troubleshoot?

We have two DL360 G5s that suddenly lost iLO connectivity. They are at a remote site, so I cannot do any physical troubleshooting (yet). Is there any way I can remotely troubleshoot the iLO? Currently ...
4
votes
3answers
5k views

Virutal Machine loses network connectivity on Hyper V Cluster

We're running a number of VMs on a 6 node failover cluster of blades using Hyper V. We have an intermittent issue (every few days at different times - not a fixed frequency) of VMs losing network ...
3
votes
2answers
434 views

When do browsers request and use IPv6 DNS records?

I'm glad my new Linode hosted server offers an IPv4 and an IPv6 address as well. And default DNS records, when using Linode as NS, shows both A and AAAA records example.com 86400 IN A 203.0.113.4 ...
3
votes
1answer
173 views

IPv4 is almost out in Asia-Pacific, what are people doing about it? [closed]

Asians and those in North America are going to be separated on the internet if ISPs / telecoms don't do something. European progress to IPv6 is taking place much faster than in North America. What ...
3
votes
5answers
4k views

Troubleshooting loss of network connectivity in Windows 2003 - What else to check?

We are facing a weird problem in our data center. Our Backup server (running EMC Networker) loses network connection every alternate day around 3:00 AM (Backup schedule starts at midnight). After 2 ...
3
votes
3answers
240 views

Losing SQL connections

sql servr 2005 - Standard; one dedicated sql server (VM); windows server 2003; Small databases; About once a week we lose all sql connections. It seems to fix itself after about 5-10 minutes. ...
2
votes
9answers
2k views

What are the connectivity implications for implementing a hidden Wireless SSID?

Should we be suffering from connectivity problems due to having a hidden SSID? At work, we're past the "Hidden SSIDs make our network more secure" argument, but for user's 'convenience' and in order ...
2
votes
4answers
1k views

Is there a tool to log internet connectivity on a mac?

My mac runs as a server with an dyndns ip. To work properly, it must be connected to the internet all the time. but unfortunately it seems that it is not connected a lot of times during the day. So I ...
2
votes
2answers
275 views

What are the steps to set up a Hyper-V solution with one NIC

I have successfully installed centos on a virtual machine via Hyper-V on Windows Server 2008 R2. This server has one NIC. I have created a virtual NIC, and virtual subnet, and within the virtual ...
2
votes
1answer
244 views

why a network's graph connectivity (k-connectivity) is not a good way to judge reliability?

I was told that a network's graph connectivity is a "dangerous" way to judge reliability. Why is that? In my mind, a complete graph (the most connected graph) is the most reliable network possible. ...
2
votes
4answers
9k views

Mac OS X 10.6 issues connecting via vpn to Microsoft server

I am currently running Mac OS X Snow Leopard and trying to use the native vpn client to connect to our Microsoft vpn server. If I route all traffic via the vpn connection I am able to connect to our ...
2
votes
3answers
373 views

Provisioning development environment on the Cloud

I'm planning a development environment on the cloud. My target platform is Microsoft .Net and preferred cloud id Amazon AWS (although I'm open for suggestions). I'm planning to purchase a High-Memory ...
2
votes
1answer
249 views

Dell PowerEdge 1600SC Server - Ethernet port semi-functional

Dell PowerEdge 1600SC Server: First it had Fedora 12 with Amahi Home Server on it, then I installed Windows Server 2003 Standard on top of it. The ethernet port worked for Fedora and Server 2003, but ...
2
votes
4answers
1k views

Ubuntu vm stops responding to host intermittently - but still responding to other network computers?

I'm running an ubuntu server (bitnami lampstack) vm in vmware-server on a windows host machine. The vm every 10-20 seconds stops responding to the host computer for no apparent reason. I can still ...
2
votes
2answers
235 views

Win98/DOS losing connections to Server 2003

We recently upgraded from an old Linux server running Samba to Server 2003. All of our clients are Windows 98 virtual machines, and heavily access the server for file services. ~95% of the time, ...
2
votes
1answer
47 views

Is there a better way than VPN tunnels to access local tools in remote DCs?

I have created a fancy interface which pretends to be an unified interface to access to different local tools located inside different datacenters. These tools are not accesible from the outside. To ...
2
votes
1answer
82 views

Are there any other causes of this error that are NOT related to initial setup?

I'm trying to diagnose an issue at a customer site. They are receiving the following error: A network-related or instance-specific error occurred while establishing a connection to SQL Server ...
2
votes
1answer
346 views

SQL server intermittent connectivity issue every 4 or 5 days

I have a .net web application that calls sql server 2008 running on a different server. From last couple of weeks, after every 4 or 5 days, web applications connectivity to sql server becomes an ...
2
votes
2answers
162 views

Upgrade from MySQL 4 to Mysql 5 - same my.cnf - lots of random disconnects

I've recently moved from MySQL4 to MySQL5 (we had apps that required MySQL4 which we'd finally replaced) Since then, I've been having LOTS of issues similar to:- connect() failed: Lost connection to ...
2
votes
1answer
396 views

How to properly setup a Virtual Network on Hyper-V (Windows 2008 R2) that provides external connectivity to guests

I have a Hyper-V machine with one NIC card. I've set up a Virtual Network and provided connectivity to the guest OSs. The problem is that on restart of the host machine, i start up with no ...
1
vote
2answers
976 views

In what kind of environment multicast is not preferred?

While reading a product documentation I came across a line in which they say product supports TCP communication in environments where multicast is not available or preferred. Why would a company ...
1
vote
4answers
2k views

Unable to connect to Red Hat port, but able to ping?

Let me preface with this that I am a linux and network noob, so talk slowly and use big words. We have a Red Hat machine running GNOME 2.16. We're trying to stand up a webapp there. From the windows ...
1
vote
3answers
4k views

SQL 2008 R2 Named Instance Client Connectivity Issues?

We're upgrading our software from using SQL 2000 to 2008 R2. Our customers will be installing an update which uninstalls 2000 and installs 2008 R2 under the same instance. So if no instance existed, ...
1
vote
2answers
284 views

Unable to connect to domain controller from laptop

i have a windows 2003 domain controller and am unable to get one of my laptops to join to it. When i try to change from workgroup to domain it connects, asks for for a username and password and after ...
1
vote
4answers
279 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 ...
1
vote
4answers
3k views

Error Connection to SQL Server using [HOSTNAME]\instance or [FQDN]\Instance, [IP]\instance working

This one's kind of weird, at least to me. I've got MSSQL server 2k5 (STD) installed on Server 2k3 R2 SP2 (on account of some legacy software that doesn't yet support x64 or Server 2008), using ...
1
vote
2answers
2k views

Working with Dell PowerVault MD3600 SAN

I've been tasked with looking at a couple of different IT projects. One of which is adding a DELL PowerVault MD3600i with 12 2TB HDDs in a RAID 5 or 6 combination. That's fine, no problems. My ...
1
vote
3answers
368 views

IP connectivity to other countries ? mirror ? what is it?

Is it possible to have an IP to act as a local IP in different countries ? For example the ip 193.105.173.105 which seems to be located in US but is handled by RIPE.net Internet Assigned Numbers ...
1
vote
4answers
118 views

Throw Away Dial-Up Account

I'm going away on vacation to a location in Canada where highspeed internet access is not readily available. There's been a dial up connection until this year, where it got cancelled to save money as ...
1
vote
1answer
669 views

How to diagnose intermittent connectivity issues

At work we are suffering some intermittent faults with the internet. This manifests itself as none of our desktop computers being able to make any requests externally including to ip addresses for a ...
1
vote
1answer
206 views

Can't telnet from windows machine to OS X laptop on same network?

I'm trying to telnet from my windows box into a service running on a known-available port on a mac laptop, but the connection is getting refused. I can telnet into the service locally. Firewalls are ...
1
vote
2answers
1k views

Cannot click send button in Outlook (+ Exchange) for unknown addresses

I have a very unusual problem. I have Outlook 2010 connected to Exchange 2010. This can send emails perfectly to known addresses (that is, addresses in the address book or ones that have been sent to ...
1
vote
1answer
5k views

How to enable `Keep Alive` in a shared hosting environment?

I have only acces to the php.ini file and my good old .htaccess file. Where do I enable the Keep Alive setting? ( Im on a plesk 8.2 )
1
vote
5answers
1k views

NIC status stays at 'Network Cable Unplugged' although cable is present

I'm having a problem with a couple 10GB NICs, one in particular in Windows 7 x64 that always thinks the cable is missing. The drivers for the NIC are current, downloaded from Intel- it's settings are ...
1
vote
1answer
2k views

Can not connect to filezilla server over IPv6

I am trying to connect to a filezilla server running on a windows server 2008 R2. If I put the hostname in to the filezilla client it tries to resolve it to the IPv6 address of the server (I can ...
1
vote
4answers
2k views

Can ping websites but unable to view them

Windows Server 2003 32-bit. We have moved the server from one office to another, with a new external IP address. The firewall/router is fine as we can connect a laptop to it with a static IP address ...
1
vote
1answer
4k views

Exchange 2003 Intermittent Active Sync Connectivity

Our environment is Active Directory 2003, Exchange 2003, with a mix of 2003, 2008 R2 servers. The only thing from the exchange side that does not work is Active-Sync with mobile phones. OWA is ...
1
vote
3answers
580 views

Remote Connections Timing Out to SSH/HTTP in Parallel from Multiple Locations, but not PING, why?

QUESTION: Remote Connections Timing Out to SSH/HTTP in Parallel from Multiple Locations, but NOT PING, why? ISSUE: Have a web server that has remote connections timing out around 50% of the time in ...
1
vote
2answers
367 views

Windows 2008 Server and Subversion

I have a box with Windows 2008 Server, and I installed SVN. I want to connect to svn from a different Windows 2008 Server, and they are on the same network, both are in my office. Do I need to ...
1
vote
1answer
195 views

Network connectivity weirdness (local net but no internet)

Here is my situation: I have a computer (A Dell) with a Broadcom ethernet card and an Intel Wireless card. The wireless card is disabled, the Broadcom enabled. The broadcom card has a dedicated IP ...