Greetings. Our ASA syslog has been throwing 507003 errors (see attached graphic). From what I've read, this is normal as the ASA is doing what it's supposed to be doing.
My only concern is that the source IPs are our internal DNS servers and the destination IPs are either our ISP's DNS or a public DNS I have listed (18.104.22.168). Anything to be concerned with ? There are no ill-effects on our network that I can tell.