Strange Entry in Log File

I have this entry :80 in my log file

[MickeyRoush]

Can anyone tell me what this is? Or what they're trying to do?

Here's the entry from the log:

123.456.789.012 - - [10/Jul/2011:09:03:05 -0400] "GET / HTTP/1.1" 403 - example.com:80 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)" "-"

The part in question is the :80 on the end of the example.com

What are they attempting here? Access through port 80?

Thanks!

[brotherhood of LAN]

Yes, the colon/digit combination is a specific port name in a URI. Port 80 is the bog-standard port that web servers use to listen to incoming connections. Nothing to worry about.

[wilderness]

Here's an old (2008) thread [webmasterworld.com] with a valid answer from this forum's moderator.

[MickeyRoush]

Thanks to both brotherhood of LAN and wilderness!