I’m having a similar problem. I tired to respond to a comment on my blog and was kicked out to a “page cannot be displayed” error.
Blog: https://www.thewrittenway.com/jlog/
Submit link: https://thewrittenway.com/jlog/wp-comments-post.php
I am using fHeaavn 1.0 theme with no further mods and have these pligins active:
Search Hilite 1.2
Hello Dolly 1.5
MarkDown 1.0b4
It seems to only prevent me (or my computer) from posting comments.
