cannot change anything on CSA 'Gateway service configuration' tab

Hi,

CSA 4.3.1-177

Gateway service v.8.7.0.3

Ivanti core server v.10.1.10

I am logged to the CSA with user admin. I can change settings on all tab in my CSA except 'Gateway serive configuration' tab.

Anything I enter and click on save button, after refreshing screen, it desappeares.

Have anybody an idea what is wrong with my CSA?

thanks in advacne for any hints

Andrzej