It's already reported: https://forum.eset.com/topic/4776-forumesetcom-this-page-cannot-be-displayed-ie11/
Hello, Whatever the issue was, I am able to access both the ESET forums and the Malwarebytes forums now via IE11 (on my system at least). During this time, I also could not connect to either site via my Windows phone but that issue is now fixed as well.
Fixed for me as well. Can get to both the ESET and the Malwarebytes forum on IE. Thank you Kent for letting us know!