Whilst running the SSRS on the Archive/ Monitoring Server I was getting the following error:
an error occurred when deploying monitoring server reports.
an underlying connection was closed.
an unexpected error occurred on send
The fix for me was to remove all binding from the Web Services URL and Report Manager URL in the Reporting Services Configuration Manager and then to add back only the HTTPS binding against both IP4 and IP6.
Hope this saves you my head-ache.