Network connection problem with Windows 2003 Server

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Hi,

i have a network problem with a Windows 2003 Server (SP1).


It's a HP DL380G4 located with others servers in a remote site
connected through a Cisco site-to-site VPN.


Every 15 minutes:
- it stops responding to every network activity ( VNC, RDP, ODBC )
except PING from remote clients in LANs different from his own ( the
fact PING keeps working seems to me very odd)
- it keeps responding to every network activity within his LAN.


In fact, to keep working, I'm obliged:
- to connect to this server from another machine in his LAN
- then to DELETE the route table entry to remote clients it has created



- then it starts working again with remote clients for 15 minutes...


Help me!
Thanks in advance.
Stefano

.

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