Error sending server signature

Setup of two servers, 1 local 1 remote. Remote server has this in server logs.

06/13/17 14:35  	DEBUG  	Connecting to target service...
06/13/17 14:35  	DEBUG  	Established internet connection. Service=0
06/13/17 14:35  	ERROR  	Error sending server signature to client
06/13/17 14:35  	DEBUG  	Authed+capa for client 'ADMIN-PC' (encrypted-v2, compressed-v2, token auth) - 1 spare connections

Issuing “Full File Backup” on remote server instantly fails with to errors in logs.

View on client.Internet server is not listed but active? Any suggestions?