NT target must have licenses available to establish a session. A server overcommitted on its licenses can respond to ping but not a session oriented protocol. Net commands require port 139 to be enabled on routers. A router may be misconfigured to only support small packets. 4048 Verify that target is not hung.
Ping has been know to generate responses on hung systems.
Ping the specified host until stopped. Set Don't Fragment flag in packet. TOS Type Of Service. You will be doing network troubleshooting if you are an NT admin.