Thanks so much @MrGeneration !
That worked for me… added the lines and restarted apache… works. I can log in again.
Have to forward that hint to a colleague who also runs a Zammad installation.
edit:PS: Today morning was another stable update available
New version: 3.2.0-1575387475…, Version from yesterday: 3.2.0-1575357814
I installed it, because I thought there will be a quick fix for that issue from yesterday… but there was no change and it still didn’t work… but your solution worked after that…