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Wierd Site to Site problem

i just established a site to site VPN. Everything appeared fine but when I try to ping certain devices from the remote site to the local site they time out. It works on most of them but not a few really important ones. For instance I can ping (a server) fine but cant ping (another server) or (our avaya phone switch). When I try to login to the server I get the following error on the logs:

4 Jul 24 2007 15:55:33 419002 Duplicate TCP SYN from inside: to outside: with different initial sequence number

Any idea why I cant connect to these devices? I looked at the interfaces and dont see any errors and I only get this error when I try to connect to the server that doesnt work.

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