Access denied after ip change

Hi everyone

I am fairly new to the UCS universe. So this is probably a minor problem. But I just can’t figure out the solution.

Our server had to move to a new subnet. So I changed the IP as stated here That worked so far, I get via SSH and web interface to the server and the DNS name is also resolved correctly.
But now there is the problem that no user can log on to the NAS. Windows simply says Access Denied with correct user data and with incorrect data that the folder can not be accessed. I suspect that it is a problem with the Samba, but as I said I do not have much idea of UCS, I do not know where it sticks.