It took me a long time to find this (should have taken 10 minutes), but I fixed the server issue. Something had gone wonkers with the driver for the publicly accessible nic. I went in through the lan nic and shut eth1 down. When I brought it back up, all is good.
It should have taken 10 minutes 'cause I looked at everything EXCEPT the system logs. tx/rx timeouts on the nic many times a second. sigh.
It should have taken 10 minutes 'cause I looked at everything EXCEPT the system logs. tx/rx timeouts on the nic many times a second. sigh.