Have a Routerboard RB2011UiAS-2HnD-IN router, nothing special in configuration (DHCP, dynamic IP from ISP and WiFi hotspot).
The problem is I cannot access https://socialclub.rockstargames.com/ and probably some local IPTV service due to a mystical problem with my router.
I have tried to disable a firewall on my computer, so as removing DNS settings from the router. That didn't help.
After that, I decided to connect the IPS cable directly to my pc and I finally could access those websites.
What could be the problem and how I can solve it? Never saw anything like that.