We have two Cisco 3005s that I recently tried to upgrade to the latest firmware (4.1.7). The first one went just fine. The second one seemed to go OK, but users had problems. Anyone making a PPTP connection could log in, but no traffic seemed to be flowing (bytes transmitted seemed rather low, especially compared to bytes received). I went back to the old version (actually, the old version was 3.6.7 and the closest I could get my hands on was 3.6.8), and everything was happy again. Where might the different be? As far as I know, the two concentrators are the same model, with very similar configs.
This seems like it may be related to another problem we're having with a sister company. Everything seems OK, except for PPTP, which doesn't seem to work (it's almost as if something's blocked somewhere, but as far as I know, there's no packet filtering in the way).
Thanks!
--Steve