Error 500 After Upgrading Server & PHP & MariaDB

[GrooveOnBeat]

PHP: 7.2.16
MariaDB:  5.5.5-10.0.38-MariaDB

After going live with the new server I've been getting a lot of Error 500...A lot. The downtime can be several minutes to many hours at a time, and happens every day.

I did not have these kind of issues/downtimes on the old server.

I suspect that when the PHP was upgraded the custom settings were reset. Therefore I'm getting the Error 500.

Are there any PHP configurations, like memory, or time out, that I should set?

Any other suggestions?

[Daniel F]

Do you see any errors in your server logs ?

[GrooveOnBeat]

@Daniel F

I see quite a few of

"client denied by server configuration"

I noticed cphulk was disabled. I could have sworn it was enabled on the old server.

I added a bunch of IP's into the blacklist.

 

Is that a good start?