weird scan pattern

[joe () ITS UNIMELB EDU AU (Joe H)]

Hi all,
Does someone know the signature for this "attack"?
Note:
A. The host mentioned on the right is one of our hosts
B. It is not a possible for someone to be running a probe
   to the remote host ("proxy...") since no one has perms to
   run services/programs binding to < port 1023 on ourhost
   (and ourhost has not been r00ted).
C. The remote host appears to be a proxy server

Is it a user from "proxy..." who thinks that our host is running a
web server (which is is'nt)? What appears strange is the almost
exact +1 incrementing port numbers from the source ("proxy....") host.

May 28 14:47|proxy.library.uq.edu.au|4114|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4115|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4116|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4117|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4120|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4121|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4122|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4124|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4125|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4126|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4127|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4129|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4130|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4133|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4134|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4135|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4137|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4139|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4140|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4141|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4142|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4143|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4144|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4145|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4147|ourhost.ourdomain.au|80
May 28 14:47|proxy.library.uq.edu.au|4149|ourhost.ourdomain.au|80

<<<list goes on and on at a rate of about 200/sec>>>

Kind Regards,
Joe