I updated 2 x 7.3 and 3 x 7.4b1 and nearly everything was fine except of
On a 7.4b1 update webtop5 completely lost the AD connection - NethServer domain wasn't there anymore - I had to create it again(could copy from another NethServer), binary bind password didn't work with copy paste, but DOMAIN\admin worked. This webtop5 did not work because of the binary password after install some time ago so I changed the config and it was a test vm for some time, maybe this was the reason.
With a fresh installed webtop on another updated 7.4b1 webtop looks ok, even with binary password:
Working on the Nethservers at first look:
nextcloud via android
nethserver http mirror
webtop5 AD login
Maybe you already tried but...just an idea...disable firewall with "shorewall clear" for testing
Found at the end of this thread:
Fresh install with new iso also worked in a first test.