RPC-HTTP Port 1030

I am successfully using RPC-over-HTTP to connect my users. I just noticed
something in the firewall logs that I can't figure out, and it just bugs me
that there is something happening here I don't understand.

As Outlook is doing its thing, you can see requests like these in the
firewall monitor:

----> http://my.external.server:443/rpc/rpcproxy.dll?my.internal.server:6001
----> http://my.external.server:443/rpc/rpcproxy.dll?my.internal.server:6002

All of which are accepted by the rpcproxy on my.internal.server and make
sense. Every so often, though, I see one with a different port number:

---> http://my.external.server:443/rpc/rpcproxy.dll?my.internal.server:1030

That one is rejected, in spite of the RPCproxy's "ValidPorts" options being
set like so:

---> my.internal.server:593;my.internal.server:1024-65535;

Also, I can see (with netstat -an) that the Exchange server is using this
port extensively. That makes me wonder what it is, and why the RPC proxy is
denying it.

Can anybody shed any light on what this port is used for, and whether having
these proxy calls get denied has any bad effect?


.

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