ports 29990 and 51417 scans

[Dallas Jordan]

Checking my snort logs this morning, I found several nmap TCP scans to port
29990 from about 6 different IP addresses.  I also noticed that last week we
were scanned from these same addresses on port 51417.  Has anyone else seen
this type of activity?  I tried to find out some info on these ports but
turned up nothing.  I suppose these could be just compromised machines doing
random scans for these ports?  Does anyone know what could be using these
ports?  Thanks.