I tried with my existing SAP credentials but it throws error: MMS Authentication Failed : Login Failed: user 'verakovic@sapusers'.
Now I tried to reach SAP server from browser directly from machine on which is Mobile server installed, just to exclude VPN issues, but it's ok, Mobile server is in the VPN.
Maybe I need to set registration to automatic somewhere (?) or cookie name isn't MYSAPSSO2, it's just guessing..
Any idea?