<<TCP Provider: No such host is known. >> try debugging why this message is coming....
from source machine try below...
ping to see ip is accesible
telnet to below ports to ensure file copy ports are open...(try to manual copy file to see if it works)
UDP 138, TCP 139, TCP 389, UDP 389, TCP 445, TCP 135
Share your findings and result of any other troubleshooting you have done...
Prakash Heda
Lead DBA Team - www.sqlfeatures.com
Video sessions on Performance Tuning and SQL 2012 HA