Upnp & dns have already been tried & tested.This can be issue not related to app itself. Setting up PnP on router can help, also changing DNS in ps3 to 8.8.8.8 and secondary 4.4.4.4 can help.
Next thing is that some netflix servers was vunerable for CVE-2014-3566 so they probably not allow to connect older client. But if app is working for one person and not working for another, then is something else.
No help.
Also I doubt that the freezes experienced with EU 1.04 are due to exploit patching because if it was the case, it would likely not work at all rather than freeze at random every 1h or even every 10mn for some people apparently.
As I said, no certainties, just hunches & doubts so far.
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