Mirror Manager is trying to perform an HTTP GET against the listed URL and the response it is getting is an HTTP 407:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/407This response comes from a proxy server so I'm not sure how it would be possible for this to occur with no proxy in place.
To use mirror manager with a proxy server requires you define the proxy server along with any required credentials in an environment variable:
Using SAS Mirror Manager with a Proxy Server
https://go.documentation.sas.com/doc/en/calcdc/3.5/dplyml0phy0lax/p1ilrw734naazfn119i2rqik91r0.htm#n...
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Greg Wootton | Principal Systems Technical Support Engineer