Timeout on remote connection

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Hello to everybody,

I have a problem with what seems to be a timeout. I'm connecting to several R/3 systems which are in the same network, from outside that network with a VPN; the IP address of every application server in that network is NAT-ted to a local (virtual) address in my network. Every one of those R/3 keeps me logging me out after about 60 seconds inactivity, which happens very frequently, and I'm not the only one to experience this.

The problem is that since the timeout does NOT affect those logging from inside the target network, support says it's not a parameter set on SAP system, but a network problem: from my point of view, the TCP/IP connectivity seems to be fine with no packet loss. The reported error is:

Connection to 'localip:localport' broken

WSAECONNRESET: Connection reset by peer

I know nearly nothing of SAP AS Technology and Network Ops, so can someone tell me his opinion?

Thank you!