Help with connection details..

[snootalope]

I'm trying to understand this. Neither of the following IP's have anything to do with our public range but when I do a "show connection detail" this one connection is always there:

UDP outside 10.0.100.11:9999 inside 24.173.73.130:61588___idle:0:00:04___bytes 90540528___flags -

I just can't figure out what this is and why it's even showing up at all. Of course we don't have anything on our asa that permits any external->internal udp connections. Can anyone help me out with this?

 

[snootalope]

All or our internal/private address are 10.10.x.x -- I just can't understand why it's saying it's hitting an internal IP at 24.173.73.130.

We've got other udp connections showing up in the logs but they're all ntp related and expected to be there..