Tue Jul 16 23:51:50 PDT 2002 — DNS server issues. We experienced hardware problems with our secondary DNS server which caused mail servers to refuse connections for about 5 minutes. Our mail servers use this secondary for their primary DNS server as it is more available. They fail over to the primary nameserver when the secondary fails. However, the health check that the mail servers perform to determine if DNS is available didn’t identify this error. We are reworking the health check algorithm to avoid this problem in the future. The server has been taken offline and the nature of the problem is being investigated.
We also experienced a DNS configuration error this morning which caused some mail delivery to be delayed. The problem was resolved as soon as it was discovered. -Matt, Nathan, Dane and Kelsey