Face Time in 10.7.2 Lion

Question

Hello Folks, I am UK based
I recently became an Apple convert.  My system is an late 2009 27” iMac with a 1Tb TimeCapsule.  I use an Ethernet wired connection for my iMac from my modem/router router with wired Ethernet HomePlug for my TV and other Windows based PCs.  Laptops can access the net from either the TimeCapsule Airport wireless or the wireless modem/router depending on wireless card and software.
I see the threads regarding Face Time connection problems.  Perhaps my experience may be of some help.   Please bear with the longish story before I get to the point.
I started to question my ISP about my poor download rate through my local exchange by using the ADSL and Fibre to the Cabinet diagnostics tool from speedtester.bt.com.  I took readings over many months and showed that on my supposed 8Mbps download rated line I was getting anywhere between less than 1 to 4.5 Mbps.  I eventually was told by my ISP that it could be my old modem/router and that I should try to upgrade to an ADSL2/2+ variant to see if that improved the rate. The ISP told me that the modem/router and the network card interact and the network card in the exchange decide and set the IP profile to what it thinks my router and the line can handle.  Fair enough, the exchange is 3.5 miles away and we are fairly remote in the countryside.  The speedtester states that for my connection, the acceptable range of speeds is 600-7150 Kbps.  I used a Belkin F5D7630-4A ADSL wireless modem/router but I changed to the F5D7632-4 in my attempt to improve the speed. I then bought an Edimax AR-7284 MnA 150 Mbps Wireless ADSL2+ modem/router in an attempt to improve matters.  This worked and I achieved a fairly consistent speed around 5 to 5.5 Mbps.
Meanwhile I upgraded from Snow Leopard to Lion 10.7 from the App store when it was released.  My daughter bought a Macbook Air.  We tried to connect through FaceTime.  When I was working with either of the Belkin routers FaceTime worked seamlessly.  As soon as I used the Edimax router we could not connect.  Nothing I gleaned from any of the support threads, changing DNS settings or using specific ports etc helped.  I asked Edimax support to advise and see if they could get the application to work but they too were unable.  The Edimax also barred me from my secure banking connection and a few other websites and nothing I did resolved this.  I had the Edimax replaced but the replacement did the same.  I then replaced it with a Belkin F5D8365uk4-v1ADSL2/2+ modem/router, this unfortunately was faulty but was replaced.  FaceTime worked seamlessly on this variant but it made no difference to the download rate from the exchange.  I now realise that the Belkin F5D7632-4 is an ADSL2 modem/router and from its LAN setup webpage shows Data Rate Down/Up of 6720Kb/448Kb and thus should give me the best that my line can give which is about 5 to 5.5 Mbps.  I have reverted to using it but still have line rate issues.
FaceTime still works perfectly with the Belkin F5D7632-4 as it did with the later variant. 
My point. 
Perhaps it is the hardware that causes all these FaceTime problems and not the Apple Software.
Thanks for reading.  Comments greatfully received.  A Festive Season to all.
Speckled Jim

Answer 1

Have you checked your firewall settings? You have to allow incoming connections for your application (i.e. FaceTime).