Thanks very much for the replies! I checked the entries in /etc/resolv.conv, and they were correct. It had 3 lines(a server name and 2 IP addresses), and these matched the information in the Windows box exactly. I also verified that the two MOZILLA_NO_ASYNC_DNS commands were the first two un-commented lines in the firefox script. I re-started the browser after verifying these two items, but there was no improvement. I let the browser running overnight (no re-boot or log out of KDE), and when I tried using the browser this morning it was much faster at resolving addresses. I can't imagine what changed overnight. Thunderbird is also resolving the pop server address much faster, and I made no change at all to its startup script. If it hadn't been for the fact that the Windows machine was fast all along, I would have sworn that my ISP made a change. Is it possible that Windows 2000 automatically caches DNS information to circumvent any problems (slowness) with the ISP's DNS servers? Is it possible/advisable to cache DNS information on Linux? Thanks again. Dom