Yes Dreamhost DID fix it. They wrote:
Upon thorough research of your site, I found that our Web Application
Firewall called Modsecurity has blocked some processes on your site that
were giving you the “internal server error”. I just did some
configurations and whitelisted some rules so you don’t have this problem
again. If you want further information on how Modsecurity works, here’s
an article that explains further:
https://help.dreamhost.com/hc/en-us/articles/215947927-How-do-I-enable-Extra-Web-Security-for-my-website-Dollar General Survey
Thanks for sharing such an amazing Blog.
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This reply was modified 4 years, 11 months ago by dana235.
