Thats what happened here:
We have 3 HP DL380 Servers. One is Gen8 and two are Gen7.
Database is hosting on EMC VNXe
(Yes i know HP Gen7 Servers are not supported with ESXi 6.5)
One GEN7 is a cold Backup Server and used for testing, the other Gen7 Servers is only for VCSA 6.5 and some other stuff.
Produktion Server is Gen8
After switching off SMB1 in Windows AD Server we decided to Upgrade ESXi 5.5 to newest ESXi 6.5U1.
I used VCSA Updatemanager to upgrade the testing Server. After resolving the PSOP Issues with HP-SMX-Provider, it was running fine.
but I can't join the Domain. Some issues as above.
The next was the VCSA 6.5 Host. I decided to install it with a modified HPE ISO on USB Stick (without HP-SMX-Provider).
It was easy and works, but without Domain-Join.
Last one: The Main System. Upgrade with full HPE ISO. It works and after Reboot it was joined by its own in the AD Domain.
So perhaps its only an issue with old not supported Hardware?
I tried to figure out if there are some wrong drivers, some VIB differences in Gen7 and Gen8 Servers, but all i can see is nearly the same.