some apps doesn't work on one of two access points

Hi,

I have two wireless access points, one is my router and the other is a linksys router I use as a switch and access point (that is, nothing connected to the WAN port). Obviously I have two SSIDs corresponding to each wireless, say SSID1 on my router and SSID2 on my linksys switch.

Some iphone applications don't work when I'm on SSID1 (on router) while they work when the iPhone is on SSID2 (on switch)!!!

Any idea why ?

Example of applications are RManager (a kind of file browser based...

some apps doesn't work on one of two access points