Unreachable host, but Putty connects fine issue

HI All, We have a very weird problem trying to move our accounts a new server. New server is working perfectly fine. Old server seems to be working fine but we cant transfer the accounts to the new server. When pinging the old server from the new we're getting destination host unreachable, but accounts are working and can connect via Putty. If you restart the network on the old server it works fine for a few minutes maybe 20 at most then destination host unreachable again. These are VM's on the same subnet. A ping from Ubuntu off that networks fine? Any ideas? server1 123.123.123.123 sub 255.255.255.248 gate 123.123.123.1 server2 123.123.123.124 sub 255.255.255.248 gate 123.123.123.1 Thanks in advance!