Phone connected to wireless but does not respond to pings I have here two phones that both exhibit the same symptoms.  One is a samsung GT-S5570 running the stock ROM, the other is a Galaxy S2 running an AOSP-based custom ROM.  The problem I have is that while they are connected to the wifi and are able to browse web sites, etc, they periodically stop accepting incoming connections and/or responding to pings.  In order to get them to start responding again I have to disconnect and reconnect the wireless connection.  Yet they are still able to make outbound connections.

Any ideas what may be causing this (somewhat bizarre) behaviour or how I can stop it?
See my comment above; appears to have been caused by a broken DHCP configuration.