I had a strange happening just recently and I can not explain what happened. I was hoping that someone may beable to shead some light on what may have been happening.
I was running a WLC 2125 with 24 AP's (6 1252's and 18 1142's) The location was within a convention center and this system was supply wireless internet access for attendees. At one point new associations to the wireless system started to fail. Two laptops side by side acted differently. Both showed a strong signal however one could connect and work fine while the other failed to even show up as attempting to connect to the wireless controller. In one location where there was a high number of wireless devices I had 5 access points spead around the room. The area covered roughly an area of 200 x 100 feet. I verified that TPC and DCA where working and I was seeing proper channel assignments as well as power being set correctly. This area many people could not connect. The other area was smaller. This was maybe 70x40 feet and had 5 AP's spread around the room. This area worked perfectly with no complaints.
Now comes the strange part. When the 2 of the 5 AP's where shutdown and any rogue AP's where placed on say channels 2,7, and 10 then the issue disappeared. The rogue AP's where operated my booths and where allowed to operate for the event. What I can not figure out is why decreasing the number of AP's and the use of non-standard channels fixed the issue with clients not being able connect.
Any informatiomn on where to look to explain why this solved the issue would be great.