Sorry for taking so long to reply.
I am using Windows XP Pro
I went to options/ports in 7.1 and could not find how to disable the range. I have enclosed a screenshot below, unless you want me to clear both boxes? not sure what you meant.
Also disabling uPNP had no effect!
Even if it is upnp why is mIRC6.35 not affected?
Many thanks. http://img412.imageshack.us/img412/5692/mircscreenshot.jpg