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Packet Loss over IPSec Tunnel - Strange!

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Thank you!

9.0
We run IPSec Tunnels between different endpoints this work fine for 5 years and suddenly it struggles.
now some traffic is goin wrong. larger packets dont go through the tunnels, but not from all clients!
one pc out of 20 with WinXP works, and another with vista works too.
we reduced the network to following configuration:
ProviderRouter-PIX-PC and have folowing result:
starting telnet on remote host (which is always pingable)
it stops after entering user and password.
on the other (vista) pc ist works!!!
The packet that didn't come through is a larger packet.

The PIX is a 515E and runs 6.3(4) and we tried a the same config on a 506 - the same

is there any idea?

Thanks
Reinhard
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