Unable to add vCenter to Skyline collector

[GordonPM]

I've successfully added a proxy server, and followed what I think is applicable as below, but get this message:

If I amend the urls to use the suggested port (7444) then this error occurs instead:

Does anyone have any other suggestions?

[GordonPM · Accepted solution]

Turned out to be a type in the STS url

Should be:

https://myvcsa/sts/STSService/servicename.local