Sorry. The administrator has banned your IP address
 

Every too often, now and then my non-banned members get this strange message:

Sorry. The administrator has banned your IP address. To contact the administrator click here


I check the IP's and they are not banned nor is the member banned. I cannot understand why they get this message nor do I know where to start to trace this. Any IP's mods I have are below

Log Logins Hack (maybe?)
https://vborg.vbsupport.ru/showthread.php?t=92266

ipInfo
https://vborg.vbsupport.ru/showthread.php?t=96834

Use real ip when proxy server is detected.
https://vborg.vbsupport.ru/showthread.php?t=95198

The one today is an AOL IP, which if I'm not mistaken they use proxy 100% of the time?

Thanks in advance.

Non of those hacks can ban IP's - that check is done almost before anything else on the forum. You probably have a partial ip address in your ip ban list that is sometimes being matched.

Yes I checked for partial but nothing there either. Strange.

This is a common thing that has to do with like providers like AOL, which use a very strange way of handling proxies /IP's. When you IP block one AOL IP, (no matter if a IP WHOIS says it's non-portable) you will block a *lot* of other AOL users as well. You need to unblock all AOL IP's to get rid of that problem for the user that complained recently. Comcast is another provider that can give these kind of proxy troubles. Other than that; trace all IP's before you decide wether or not to block them. Make sure that you do not block portable IP's.