Goodmorning all! 

I have a problem with FTP connections using my Deco M5 network.

After 10 seconds (or less...) of files transfer, the connection close and my ftp software tells me "Connection not available. ETIMEDOUT.." 

My Decos work in Router mode, and are connected to a Technicolor router (of my internet provider) where WiFi and all other resources are deactived with DMZ to the Main Deco.

If i switch, and connect my Macbook to the LAN directly on the router Techicolor, the FTP restart working without problems... Of course, if I come back to the network created by Deco, it does not work anymore... 

Same thing using different devices (PC or Macbook), or using Wifi or LAN.. 

How can i investigate to try to fix the error? Is a little bit frustrating...

Thanks! Matteo