I'm having an issue where some users (randomlly) dont have access to our mail server internally.
They are dynamic ips.
I have noticed that none of the static IP machines are having this issue.
also, if I go to the client machine directly, I'm able to run ipconfig /registerdns and it will resolve the problem (the client can ping all servers by name) for a random amount of time (an hour to a few days).
Any ideas what would be causing this?