Going back to index.html causes Error 521

I got my first website running but there is an issue.
I have mysite.domain and www.mysite.domain set up.
For some reason going to mysite.domain gives a 521 Error.
Using www.mysite.domain does not.
And once I am on the site, I can browse but going back to the index page, either by using browser arrows or the links on the site causes a 521 Error. No other movements to any other page has the same result.

It is possible that these issues are unrelated but I thought i’d mention them since i could be wrong.

Has anyone seen this before?

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