Hello, I am getting these error messages in my secondary nameserver, the ip in the log is of my mail server and i am not able to send or receive mails using secondary nameserver, it works with primary nameserver but not with slave. Slave resolves queries of internal domain but not external domain. Currently these messages were there in my secondary nameserver log regarding my mail server (192.168.1.7) 08-Feb-2013 11:39:52.889 general: error: socket.c:1156: unexpected error: 08-Feb-2013 11:39:52.889 general: error: internal_send: 192.168.1.7#34203: Invalid argument 08-Feb-2013 11:39:52.889 client: warning: client 192.168.1.7#34203: error sending response: invalid file Any advice?