[Q] Wifi icon not turning green ONLY on my wifi

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I have just noticed that since a few days back my wifi icon in my CM7 nookcolor is not turning green anymore. Apparently the only related problem is gmail is not refreshing automatically. Google Play is working fine and I'm able to browse the internet.

The problem must be related to my wifi, because whenever I connect to my neighbors or my office wifi, it goes green without doing anything special.

I read google play requires an specific port open in the firewall, which is not open in mine although Gplay is working without it.

Is there any specific port or another setting that should be enabled in my wifi in order to my nook to connect to google servers?

Thanks.

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Moving to Q&A

Bump. Any ideas

Out of curiosity, who is your ISP? If you have AT&T U-Verse, you might have a mega router problem. I had one with my Nexus S and the icon wasn't lighting up green either.

It's a Mexican cable network called Cablevisión.