Outside access is blocked during random times

March 26, 2010 at 11:29:04
Specs: Win Server 2003

I am running a webserver on windows server 2003. Everything is setup and during most of the time everything works fine.

However, I've noticed that during random time blocks outside access is being blocked to the server. So there will be long hours I am working on the server or on my websites without any issues (access and connection-wise) but sometimes I'll randomly get kicked off or unable to connect, this doesn't seem to happen too often but when it does it usually lasts for a few hours at a time.

When I say unable to connect... any access including RDP. One minute I can browse my site and also RDP to the server, but when this happens I can't do either. And the server does not ping from any outside connections. However, if I access our other server (through RDP) and then RDP from inside the network connection it connects and nothing seems wrong.

I've checked everything that I though might be causing this, but becasue this is happening at random times it is throwing me off.

Please help!


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March 26, 2010 at 11:58:54
That's a strange situation. I know it's obvious, but have you checked to ensure the firewall is turned off?

However, if I access our other server (through RDP) and then RDP from inside the network connection it connects and nothing seems wrong.

When you do this, have you tried rebooting the server? If yes, did that restore connectivity?

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March 26, 2010 at 12:17:02
Thanks for your prompt response. And yes this is a strange situation... initially I though it was a scheduled thing (wasn't as concerned about back then) but I'm pretty confident that its not.

Well... I have my firewall enabled/on, but I have made exceptions to the necessary ports: 80, 443, 8080, 3389 (RDP), amongst some others.

I don't think its the firewall, because for the most part I am able to access my website from any computer (inside and outside) and able to connect RDP. But when the "blocking" occurs, I am able to do neither. It literally feels like 'something' is telling the server to block my outside (static) ips and/or ports for x number of hours.

I haven't tried restarting yet.. as I am usually not around the server when this "blocking" happens especially since it is at unpredictable times. I will try and catch it sometime and have somebody at the office restart it for me... I'll keep ya posted on that, but I am still looking for a solution.


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March 26, 2010 at 12:31:58

So just after I posted the previous reply.. I noticed that I couldn't access my website ( but was not able to test whether I could connect through RDP, since at work I don't have that access). However, I suspected this "blocking" was happening again, so I had somebody restart my server.

To my surprise... after the restart my site came back online and I could ping my server.

So now I know of A solution for a quick fix... but is there a reason why my server is hanging up like this? And is there anyway to find a more permanant fix? I don't want to be restarting my server everytime this happens.

Thank you again!

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Related Solutions

March 26, 2010 at 14:33:33
This could be an issue with the NIC, or possibly the TCP/IP stack on the server.

If you have another NIC you could install, one you know works, I would try that. Disable the onboard NIC (if the one you're using now is onboard) and then see if it doesn't behave properly with a new NIC.

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March 27, 2010 at 17:47:45
Thanks for the reply! I'll try and install a new NIC next week when I visit the office. However, how likely would this be the case if I am not losing any connection within the inside connection? The inside connection is absolutely solid.

Also, I've had this problem for a while now... but recently I switched from IIS6 to Apache httpd to host my sites. Ithink within the last couple of day (2-3) the blocked connections have been happening more than usual. Would apache have anything to do with this problem? I don't see how it would, but want to cover all my bases... just in case.

Thanks as always!

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