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copied!<p>Assuming that the same binaries/configs work one-way but not the other would tell me something amiss in the networking side of the house to start with. </p> <ul> <li>You're using IP addresses - double check the bound addresses on target machine against config/code with IPCONFIG /ALL. </li> <li>Does the "server" machine have multiple NICs? Is the service bound to one NIC not both for example?</li> <li>pinging the server will tell you that ICMP is routable between machines - can you create session orient requests e.g. opening UNC paths on the server from the client. </li> </ul> <p>Beyond Firewall, the only other connection refused experiences I've had have been:</p> <ul> <li>Name Resolution - preexisting host entry was wrong. Shouldn't be an issue here though.</li> <li>IPSEC oriented - different policies between machines prevented one from accepting inbound connections from the other. Possible if you work in a corporate secured environment. If you do work in an IPSec environment check for simple stuff like clocks, valid machine certs. All of these can prevent IPSec sessions from being established.</li> <li>stress issue - IP stack exhausted free TCP control blocks through misconfiguration of a server. Equally sounds like you can't get any connection going - probably not the issue.</li> </ul> <p>I'd start with Firewall 1st - either by setting policy to exempt inbound requests on that socket, trust all sockets from the source IP, or by disabling it all-together. (personally the latter is quick and dirty as a test, but I would do the former in a production environment)</p> <p>Beyond that event logs, audit trail if you do have firewall enabled but punched through. Netmon etc. all become your friends.</p>

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