Server seems up, but accepts no connections whatsoever

Posted by Rnatau on Server Fault See other posts from Server Fault or by Rnatau
Published on 2011-01-11T12:40:47Z Indexed on 2011/01/11 12:54 UTC
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linux

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networking

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server

Hi, I have a problem with a Debian based Server, unfortunately housed in a remote location. Two days ago, it was suddenly down and completely unreachable. After having someone reboot it, it worked for about a day, then seemed to be down again.

This time, however, it was different:

-The server reacts to pings

-It is scannable, and all the relevant ports are open But:

-Open shells were immediately blocked, and no warning had been shown

-It's not possible to open any connection - the TCP/IP handshake seems to have some problems:

As this is a private server of a small community, we don't have the resources to pay a technician to fix the problem for us, so any hints how to fix the problem after the next reboot would be highly appreciated...

Thanks a lot!

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