We recently upgraded to SMP 8.1. Trying to stage latest Adobe patch and also update PMImport fails. These were working fine before the upgrade.
Download failed for: https://fpdownload.macromedia.com/pub/flashplayer/pdc/188.8.131.52/install_flash_player.exe
The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.
The remote certificate is invalid according to the validation procedure.
During the upgrade the Proxy settings were removed
Post 8.1 upgrade
Add the correct Proxy Settings back to the SMP Console, and downloads were successful.