IPv6 - Transfer problem

Hi, We have the following problem: When we want to transfer accounts from server "B" to server "A" we log-in to server "A" start transfer and it failes. Server "A" has only IPv4 configured, while "B" has IPv4 and IPv6. We are getting the error : ERROR: ERROR: sshcontrol execution encountered a fatal error: (XID 38cj72) The password that you provided is not correct, or the SSH key is not permitted access: ssh: connect to host xxxx:xxxx:x:xxx::xx port xxxx: Network is unreachable Done [The password that you provided is not correct, or the SSH key is not permitted access: ssh: connect to host xxxx:xxxx:x:xxx::xx port xxxx: Network is unreachable] Connecting to xxxx:xxxx:x:xxx::xx:xxxx: as username...using method password...Connecting to xxxx:xxxx:x:xxx::xx:xxxx: as username...using method password... Failed: The password that you provided is not correct, or the SSH key is not permitted access: ssh: connect to host xxxx:xxxx:x:xxx::xx port xxxx: Network is unreachable