There are those casinos that are really restricting users if they're found in those countries that they're not supporting. OP isn't on that condition I guess but rather there's a problem upon his access to gamdom.
It's working on my end and OP has to try it again if it's still not working, he has to check his ISP and everything related to his internet connection. But if still no issue found there, he can contact gamdom and address his issue that he's not able to load the website.
Maybe OP can try access with casino gambling platform have restricting trough with change setting on chrome browser, change to be public DNS trough with security setting on chrome browser. I don't try but right now my country restricting access to Binance as exchange market, when I change DNS setting on my chrome browser looks working and available to access some site have restricting before like Binance, maybe could working for OP with several casino platform gambling site have been restricting in his country.
Maybe he doesn't have to try again to access the Gamdom site but try to access other gambling sites and see if he experiences the same thing or not.
Changing DNS maybe he can try but we don't know if using that method will work properly or cause problems for him.
With so many crypto gambling sites nowadays, he should be able to choose a gambling site he can visit with no problems so that he doesn't have to try something he doesn't even know if it's good for him or brings trouble later.
At least that's what many of us advise him so he doesn't get into trouble when he wants to withdraw his money later.