All of the sudden Facebook for Android stopped working [U-Verse]

Starting this week, Facebook for Android stopped working while under my home network. At first I thought it was just an issue with my Access Points, and rebooted. It did not fix the problem, so I went ahead and rebooted my main router running DD-WRT. Still with the same issue, I decided to reboot the U-Verse gateway. Unfortunately nothing seemed to fix the problem.

I performed some research online and found out that by changing the MTU size of my main router, it might fix the problem. I went ahead and plugged in 1492 instead of the default 1500; done. It fixed the issue immediately.

I wonder why it started happening all of the sudden as it never gave me any problems with the MTU size of 1500 for at least a couple of years. My guess, AT&T made some changes.

Go to this link for instructions on how to get the best MTU size.

Ping Test

Analog Intercom/Buzzer stops working with VoIP – Future Nine [fixed]

Quick post here regarding my Voice over IP provider, Future Nine, and the Analog Intercom/Buzzer at the front gate of my community. When someone dials-in from the main gate, I need to pick up the phone and press 9 to open it. It has not been working as of late, and the only way to circumvent the challenge was to reset the Linksys VoIP box. It would last a few minutes.

My current internet provider is AT&T U-Verse. The VoIP box is plugged directly to the U-Verse gateway.

Future Nine replied to my concerned and suggested to make these changes under the advanced tab (LAN port, default gateway IP –

SIP Port: 15060

I am currently testing the changes, and will update with results in the next few days.

Update 02/22:

The service is now working properly. It seems that AT&T blocks port 5060 for their own VoIP service.