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Gotten into similar problem with my N9. Gmail, Nokia acount works fine but I can't connect to Twitter and Facebook using the built-in applications. Twitter says "can't connect to twitter' and when I refresh FB I see 'account disabled' when I complete my swipe action. Only thing I suspect is two days back battery went flat and didn't charge the phone for ten minutes or so. Any solution to this problem other than hard reset/developer mode method?.
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Have you tried to delete the accounts by going to:
Accounts--->(Twitter), (Facebook)---->option (Three line symbol)---->delete.
Restart phone and add accounts again. This should solve the problem.
Hope this helps,
I tried the following:
enable developer mode in N9 settings.
ssh user@149......(so my N9 IP)
gconftool --recursive-unset /system/http_proxy
gconftool --recursive-unset /system/proxy
Then in N9:
Accounts ->create new twitter
Twitter was able to login immediately
So no osso unset was needed -> no IAPs reset
-Can't tell if it causes something else later.
-I didn't have any proxies defined earlier, so via UI was not solution for me.