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Hi @tictubso
There are no known conflicts that would cause an immediate 503 error. For this type of error I would always investigate security plugins first, but I’ve personally used all the major ones without issue.
The best way to test this would be go through the following steps:
If you can install without issue while your website is running under these default conditions, you can reactivate your plugins, one at a time, and test after each activation to see when the 503 error reappears. When it does, the last plugin activated is the likely source of your problems.
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We understand that testing like this on a live site isn’t always possible, so we recommend doing this testing on a copy of the site. Some hosts have an easy way to create a staging site. If yours doesn’t, you can copy your site using free plugins like
All-in-One WP Migration, Duplicator, or any other plugin or system you like. Your host may also be willing to create a staging site for you if you ask.
Let me know if you have any questions about this.