I attempted to change my admin url.

Originally I was going to set it up on a subdomain but apparently followed a bad or outdated tutorial. I changed "Use Custom Admin URL" to `Yes` and then "Custom Admin URL" to `https://admin.example.com/admin_abc123`. I also configured apache and dns for the subdomain but I'm not sure that's relevant.

It didn't initially work, so I attempted to revert by modifying these values in the database to what they were.

But now I get an infinite redirect. When I go to <https://admin.example.com/admin_abc123/> I appear to be redirected to <https://admin.example.com/admin_abc123/admin_abc123/admin/>.....

And I get an error:

> 
> **This page isn’t working**
> 
> 
> example.com redirected you too many times.
> 
> 
> 

How can I solve this issue?

Edit: Also tried `php bin/magento setup:config:set --backend-frontname="admin_abc123"` which showed a success message but did not fix the problem.