Syn_Recievd on port 80 , IIS 7.5

Posted by Ashian on Server Fault See other posts from Server Fault or by Ashian
Published on 2011-02-11T04:49:53Z Indexed on 2011/02/11 7:27 UTC
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windows-server-2008

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iis7

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tcpip

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attack

Hi I have a trouble on my windows 2008 server. I host several web site on it. From some days ago, my web sites stop responding on port 80 after a while. In this time I can't access web sites from local machine and from remote. I can also browse websites on other ports ( custom port that I set) I find that I have many Syn_Received status on netstat. And when web sites stop, I got only syn_received on port 80.

I have to restart server because when I try to restart IIS , it takes a long time to stop W3SVC and many times it doesn’t stop at all.

Would anyone please tell me : - How can I manage Syn Attack ?

Thanks

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