Hello there @techbrownie
502 (bad gateway) and 504 (gateway timeout) errors shouldn’t be caused by the Broken Link Checker plugin.
This should be related to server limits and/or due to other plugins/theme that is enabled on the site.
The best way to test this is via a staging site (a complete and exact copy of live site into another location/folder in the same server, using a separate DB) in where you can perform a full conflict test around it.
Also enabling WP_DEBUG while you get these errors may also get you more info about the root cause of this.
Let me know if you’d need more guidance on how to proceed with the above steps.
Thank you,
Dimitris
I’m marking this topic as resolved due to recent inactivity.
Feel free to post back any updates and we’ll carry on troubleshooting.
Take care,
Dimitris