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Running on both WiFi and mobile connection, the browser can connect to the internet ok but apps can not connect.

What can cause this?

Samsung Galaxy S

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Is your phone rooted? –  Sergiy Byelozyorov Mar 19 '12 at 12:30
    
What's your ROM? Have you ever installed Firewall? Or, activated firewall feature of Avast! Mobile Security? –  Sachin Shekhar Mar 19 '12 at 17:14
    
@Sergiy - No phone isn't rooted. –  sickgemini Mar 20 '12 at 0:58
    
@Sachin - No. No firewalls or security apps installed. Thought it might be a APN issue at first but had same issues on WiFi. –  sickgemini Mar 20 '12 at 0:58

3 Answers 3

Sometimes the culprit is much easier to solve: If accessing secured websites (https:) via the browser fails as well, make sure your date/time settings are correct -- otherwise certificates will fail. Best explained using an example:

Say, today the date is May 28th 2013 -- but your device's date/time is set to January 1st 2010. Now you visit a secure website, which is using a certificate issued on June 1st 2012 -- valid vor 2 years. Your browser won't accept that certificate, as it must assume it's a fake -- issued in the future. Same would apply if your browser's date were set too far in the future, e.g. December 31st 2014: the certificate would look "expired" to the browser, which again would not accept it.

Same applies to your apps, which often use a secured connection (hopefully!). Just unsecure connections (not using certificates) would work fine -- which explains why your browsers work on many sites.

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this is the correct answer –  Populus Oct 28 '13 at 8:13

This seems to be a software problem. Try a hard reset - that should restore connectivity. Note that this will delete all your data, so back it up first. When installing apps back try to check connectivity after each new installation - in this way you'll be able to determine what causes the problem.

Also as a random guess - do you use a proxy that only permits web-pages (only HTTP protocol)? That would explain why your browser works, but apps do not (they often use other protocols than HTTP).

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When you say "hard reset" do you mean "factory reset"? A hard reset means to turn off and on again, which will not delete any data. –  Poldie Jun 10 '13 at 12:56
    
Yes. I meant "factory reset". –  Sergiy Byelozyorov Jun 10 '13 at 15:35
    
this is an infeasible solution –  Populus Oct 28 '13 at 8:14
    
it is feasible when all else fails... although I admit it's time-consuming –  Sergiy Byelozyorov Oct 28 '13 at 8:35

Disabling the 'data connection' and then enabling it solved my problem. You should try it. You can alternatively try toggling the airplane mode (or use a widget) that should also enable and disable the data connection (both WiFi/data).

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