Where can I find logs for denied access through firewall

I have inbound rules restricting access to our database based on IP address and have specified our websites IP address (Siteground) to give it access and that works the majority of the time. Occasionally, I'm getting connection timed out on the Siteground logs when trying to connect to the database, but then it works immediately after.

Siteground just moved the server to a new database center and I've updated the IPs but this started after. They're saying there is no way the IP address is changing so I want to verify it in the Amazon logs but can't find them.