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Relay Server 16.5.5.2063 - Error 503, Service Unavailable

Dear experts,

We have come across the following issue with Relay Server:

1. Running SMP 3.0 Server SP08

2. Installed Relay Server 16.5.5.2063 from SMP 3.0 SP08 installation files - RS is running on IIS 8.5

3. When connecting from the same PC, both URLs below work and show that Relay Server is installed:
    - http://smp30pp/rs16.5/server/rs.dll

    - http://smp30pp/rs16.5/client/rs.dll

4. When connecting from remote PC, both URLs report HTTP Error 503, Service Unavailable - though the IIS instance is accessible and other web sites work without any issues

Strangely enough though, as soon as I connect RS Outbound Enabler running on the same local server to the RS instance, then connectivity to relay server starts working also from remote PCs. As if the RS.DLL could not be instantiated from remote PC, but once instantiated, it also works from remote PCs.

The same issue is on two separate installations of SMP / RS, one running SMP 3.0 SP08 and the other SMP 3.0 SP07 PL03.

Could this be a bug or misconfiguration on my side? I tried modifying every single setting in IIS, but not effect.

Many thanks everyone!

Pavel

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