IOS devices can't connect automatically to known wifi network anymore (only manually)

Hi there.
Just changed my old wifi router belkin 54g with a new sitecom 300n X2 (with 802.11n); after the change all my iOS devices (iphone4, ipod touch and ipad2) are not able anymore to automatically connect to my wifi network.
The network is recognized and after inserting the password the devices connect perfectly to the network, but if I switch off the wifi interface and then i switch it on again the devices don't connect to the known network automatically, I have to tap on my network in the list to join it, even if password is not requested anymore (just once, when connecting for the first time). My Macbook and other Android devices are automatically connecting fine.
I tried to forget the network and reconnect to it, I did a reset of the network stack under Settings->General->Reset, I did a device reset but nothing worked.
I even tried to limit channel bandwidth of the router to 20 Mhz (suggestion found in a forum) but no success, and I also changed the wifi channel to avoid interference, but again no success.
Any help will be really appreciated.
Thanks a lot and regards.

Hi there.
Just changed my old wifi router belkin 54g with a new sitecom 300n X2 (with 802.11n); after the change all my iOS devices (iphone4, ipod touch and ipad2) are not able anymore to automatically connect to my wifi network.
The network is recognized and after inserting the password the devices connect perfectly to the network, but if I switch off the wifi interface and then i switch it on again the devices don't connect to the known network automatically, I have to tap on my network in the list to join it, even if password is not requested anymore (just once, when connecting for the first time). My Macbook and other Android devices are automatically connecting fine.
I tried to forget the network and reconnect to it, I did a reset of the network stack under Settings->General->Reset, I did a device reset but nothing worked.
I even tried to limit channel bandwidth of the router to 20 Mhz (suggestion found in a forum) but no success, and I also changed the wifi channel to avoid interference, but again no success.
Any help will be really appreciated.
Thanks a lot and regards.

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