Unable to Bridge via Proxy

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Attempting to submit jobs via the Iray Server Bridge is successful when attempting via local address, and connection via proxy is successful for web interface.

However, the jobs submitted by proxy state Bridge Queue Error "Cannot reach Iray Server to create snapshots"

proxy is, say, server.*companyname

protocol is secure and port is different than 9090

The server shows that there was a connection opened and then closed by the client device.

Daz 4.12 & Nvidia Iray Server 2.57

Suggestions or advice?