If the PIX receives an RST it is going to tear down the connection in compliance with the TCP specifications. In this case it is received from the inside, i.e. from the clients. Does it always work for the same host and not the other 3 or does it always work only for one host, no matter which one it is? How is NAT configured?
External host A is able to connect to the internal host B all the time, but not to A, C or D. It always connects to host B ok, but not the other 3.
The internal hosts have any/any to the outside.
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