Cannot open some sites

Hello, i have some question about routing in ROS. My hardware - RouterBOARD 750G r2 (HEX)
In my country there are censor and i cannot open some porn sites, but i wanna see it!

In the first i have VPN tunnel to another country configured on my mikrotik via GRE tunnel w/o encryption.
After that i did Mangle → mark routing (prerouting) as TO_VPN for packets from list PORNSITES
Added default route with routing mark TO_VPN and gateway “gre-tunnel”.
Added sites that interested for me in this list and visit sites w/o problems.

But sometimes i cannot open some sites after adding in this list, and i cannot understand why?

If i try open this sites w/o vpn i will see forbidden page from my ISP. After adding to this list i will see it again! But following my logic ROS should send all traffic for some IP only via gre tunnel. How can i debug it? Maybe there are some elegant ways to solve my problem?

any solution ?

Mss problem. Try mss shaping

Envoyé de mon SM-A510F en utilisant Tapatalk

Did you try clearing DNS cache?

can you share your settings ? I need same thing..

thanks.