@pavlu Hi everyone and thanks for the help. Same problem with incognito and using mobile phone, MacBook or tablet (and windows obvioulsy).

@terziyski This is the problem. No error message is displayed (probably a bug?) before clicking "+ Add" After clicking "+add"

I am not able to set more address reservation on my router (at the moment i have 9 reservations). The error occurs in Firefox, Edge or Chrome, so i think the problem is inside the router. What can i...