This was brought up back in March and the answer I got from the forumn was
why upgrade if you don't have too.

HAs there been a fix for this problem

I install SP5 on my NW65sp3 or my sp4a boxes and Remote manager stops working

I try going to http:// IP:8008 and I get a blank page
same if I try Https:// IP:8009 I get a secure blank page

But if I just goto IP I get the Novel welcome page for the server

The console claims both Apache server and admin server are running

I've been told to upgrade to SP5 as it fixes memory leak issues and a
particular BM issue.