"ERROR Failed to resolve host name 'seed.greyblockgames.com': Ipv4Resolver::resolve, getaddrinfo failed, result=11001, No such host is known."

"WARNING Exception in connectionHandler: TcpConnection::read, WSAGetOverlappedResult failed, result=10060, A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond."

Some debug messages that I got while mining, still mine well though.