Running SBS 6 on two servers, one with BM 3.6 services.

VPN is working fine but after 5-10 minutes even with filters unloaded
stops tranfering data. First minutes I can transfer with full speed.
connection stays alive but not data is transfered anymore.
Our internet connection is a SDSL 256kbit line. We have no problems
surfing or downloading large files over a longer period.

Any ideas?

Thank you, Robert