Comments - Sudden 2013 Errors 'reading initial communication packet'
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You don't give any details, but perhaps the discussion here can help you.
UPDATE: If I nc the DB server I get the following response:
nc [IP] 3306
Host '[IP]' is not allowed to connect to this MariaDB Server. So it appears its actually a permissions issue.
Adding for others that may have same problem
I appreciate the response!
Apologies for brevity. Unsure what exact details would assist; so, was really hoping for common areas to troubleshoot.
I modified db permissions to temporarily grant usage permissions from any host from a specific user (grant all privileges on [db] to 'user'@'*' identified by 'pass';) and still receive the same error. This leads me to believe it isn't a permissions issue right?
When monitoring traffic at the DB using tcpdump, I can see the client and server establish a connection and push some traffic; however, receive the above error. This is a remotely accessible database (not bound to localhost)