The Web Proxy service makes HTTPS requests on port 443.
A connection request that specifies a different port will generate the subject message.
You can add additional ports using Regedt32, but allowing these through your Proxy Server may introduce a security risk.
To add additional ports, navigate to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3Proxy\Parameters
Double click the SSLPortListMembers value name, a type REG_MULTI_SZ, that defaults to:
443
443
563
563
Add the additional ports, in duplicate, to the end of the list. For example, to add port 444:
443
443
563
563
444
444
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