Netscape 6: Connection refused

Hello all, After upgrading my Netscape browser from 4.78 to 6.2.3 it often tells me that “The connection was refused when attempting to connect to xxx.yyy.zzz”. When I reload the page, it works (well, sometimes I have to try three or more times [:(!]) This happens on several sites that worked fine before the upgrade (like the NOLUG forum [;)]), and that show no problems in Opera or Internet Explorer [;)] Anybody got a solution for this (switching to the BrowserFromHell [}:)] is not an option for me)?