Ralph,
Just came up against this one myself.
Sounds like we are trying to do the same thing.
Trouble shooting so far:
MBG can backup to MAS
MAS can backup to MBG
MBG or MAS will not backup to off site ftp/SFTP server.
Putty to the MBG ran a SFTP user@IPaddress and logged in successfully
Took a TCP dump form the MBG. The only traffic that was seen to the external SFTP server was a ping!
Looks like it does a test to see if the IP is alive first. Can you ping your SFTP from the MSL you are trying to backup?
I am unable to continue because my router needs a reboot to allow pings from the internet. Lots of Teleworkers hanging off it.
Hope this helps
Paul