The reznet system has temporarily blocked your computer from accessing the internet because it detected that your computer attempted to open too many connections, too quickly.
This block is in effect for 10 minutes and then you will be permitted to access the internet again.
This is usually indicative of malware being present on a computer. You should ensure that your anti-malware software is up to date and do a full scan of the computer to ensure there are no problems.
Occassionally, this can also be caused by peer to peer software (like bittorrent clients) which are used to download large (usually media) files from the internet. There are configuration options in these programs which allow you to limit the number of connections that they open.
If you are running this kind of software, it is suggested that you shut it down to ensure that you regain internet access.
Should you have any further problems, please contact the ITS Helpdesk at x2273.