@rohitapp Now i am able to open my website which is working pretty fine even when blocked in bangladesh.

I have personally got this type of error in cases where i have observed one issue is with the opera and the other issue was with the dot compliance. Yes, you have heard the right because some sites in some countries are blocked by the ISP's under dot compliance and those type of sites will not opened up in any case not only from opera but also from the other browsers also and the other sites will be opened up safely. But whenever the issue is with opera, we have to follow the guidelines shared above to get it fixed or try with some other resource such as that.