I'm surprised there're so many members replying to this thread! Sorry I can't reply one by one, I hope with this post it's summarize all.
Definitely all ISPs in Malaysia prohibit online casinos because the government regulates it, it's just that not all casino platforms have been blacklisted (especially new casinos) so you can still access. Reference sources regarding your country's online casino rules say:
Online gambling is technically illegal in Malaysia. While it’s clearly illegal to host an internet gambling operation, it’s not clear if patronizing a gambling site is illegal. The laws on the books were written decades ago and none of them specifically mention the act of placing bets online.
I appreciated your effort and yeah I'm from Malaysia, to be honest online gambling is legal here... But since the majority of citizens is Muslim, it's cause taboo to gambling. There's no official law about online gambling here, I'd say it's either grey area or legal.
Okay, so the problem is from my ISP... To everyone who suggesting about to contact the provider, I don't think they will fix that for me. The thing is ISP blacklisting those websites is from government or institutions, they have 100% power here.
But upon accessing, it's the ISP that blocks the access. So Op is should just test where the cause of the problem is. If it's not the fault of the casino and your country is good with it then ask the providers or have a reset first and test if your dynamic ip will do.
What is dynamic IP and how to do that? Anyway I've heard someone changing their DNS to access blocked website, it's possible?
I will not mentioned the specific casino due to my personal reason, but surely I'll ask them about this matter.