IPv6 support

Possible to support access IPv6, currently error:

war error while creating session for shell server1: dial tcp: address xxxx:xxxx:xxxx:xxxx::x:22: too many colons in address
war error while creating session for shell server2: dial tcp: address xxxx:xxxx:xxxx:xxxx::x:22: too many colons in address
war error while creating session for shell server3: dial tcp: address xxxx:xxxx:xxxx:xxxx::x:22: too many colons in address

I force access in IPv4 but it would be great for the addition. Thx