I attempted to transfer my fastpages blog to custom domain but then changed my mind. I reverted my local repository to the state before switching to custom domain (which was fully functional) and force pushed the changes to the remote master. However, the blog link still redirects to the custom domain (which does not work). I suspect that this is related to the fact that the webpage is build not from my master branch but from gh-pages, but I do not know how to fix it. I attempted to create an empty CNAME file, but this did not work. So, how to revert to the default domain name in fastpages?
Alright, sorry for the dumb question. It was chrome causing the trouble. The site was available just fine from other devices and clearing site cookies in chrome fixed the problem.