So, now I have problems too

The setup:
PPTP VPN>win98-SME6.0-Internet-SME6.0.1-02
SME6.0-Internet-SME6.0.1-02-Win98SE<PPTP VPN
PPTP VPN>Win98-Internet-SME6.0
PPTP VPN>Win98-Internet-SME6.0.1-02
Both SME-servers are doing NAT.
IpSec could not be used, as Win98 has no support for it, AFAIK.
Problem:
After first disconnected VPN connection from W98 (doesn't matter wether successful or not), it is no longer possible to connect from that computer to any SME server, because:
C:\WINDOWS>netstat
Active Connections
Proto Local Address Foreign Address State
TCP win98:1041 SME:1723 ESTABLISHED
After a windows restart, it is possible to VPN again.
I suspect, that it is Windows fault. Unfortunately I do not have any other Win98 machines at hand to play around. Restarting servers did not help. NAT has nothing to do with it in this case.
I got the feeling, that it started after I tried to connect with a wrong password, but maybe it was a coincidence. I do not know, wether an 'unspoiled W98' would have the same problem.
I also do not know, wether VPN could work at the same time behind both SME servers.
Temporary solution:
I use TCPview to kill the hanging connection.
http://www.sysinternals.com/ntw2k/source/tcpview.shtmlAfter closing the connection, I can use VPN again.