Network issue - very very strange
Posted on 2011-03-21
Today all of a sudden, there are about 4 servers out of 20+ that are refusing inbound connections.
From the problem machines, you can ping anything and everything. Internet works.
Apart from that, nothing can communicate with these servers! Cant ping, cant browse, cant RDP. Acting very much like a firewall issue, except there is no firewall on these servers. Even uninstalled the AV to be sure.
Have done scans with Malwarebytes and Trend Online.
Looked through NIC properties, all looks ok. Changed switch ports, etc.
They are connected to a L3 managed switch and I can see the port that they are plugged into has RX/TX traffic as expected. TX is a bit on the high side in my opinion.
Free free to request any specific info.
Any ideas? I'm out of them.