I recently upgraded to VDSL, replacing my old ADSL modem (half bridge mode) and Linksys BEFSX41 router with the Telecom provided Technicolor TG589vn v2. Everything went very well except that the Linksys Media Extenders will no longer connect to my Media Centre PC. 

I tried removing the Technicolor router from the network, and put the BEFSX41 back on and the extenders all happily reconnected.

I am at the end of my network knowledge, but it appears to me that the Technicolor is preventing the connection somehow: Maybe the intrusion detection which I cannot see how to disable? 

Any ideas? I tried to put the Technicolor in bridge mode but could not get it to work with my BEFSX41, however I would prefer to resolve this (if possible) without introducing additional equipment.