Can anyone tell me please why my spark smart modem 2 wont let me remote manage from WAN. I'ts all good when im doing it form LAN side but WAN gives me wrong username/pass on first try and "other user logged in" if I try to log on again.

I know my logins.

I have enabled remote management for any IP.

I have static IP.

I can get to login screen from WAN.

Connection done through mobile wan/SIM card.

Internet speeds are good and all other stuff with modem works.

Internet is not with Spark anymore.

After unsucessful from WAN I can log in from LAN and see modem log saying that remote user sucessfully logged on from GUI.

Ive tried multiple browsers, computers, platforms.. even have copy-pasted username/password from text fail but still no luck.

I've addes some pictures 

Any ideas please let me know

Thanks