Xperia x10i complaining "no network connection" in some apps, but not others I have an Xperia x10i running firmware version 2.1-update1 from 3 (a very annoyingly-named mobile service provider).  After returning from a trip, I have noticed that certain applications are having difficulty recognizing the availability of a network connection, while others function just fine.  The cases I have spotted so far:


After spending a good while on "Loading...", the Facebook app displays "No Internet Connection.  Try Again"
The Youtube app immediately displays a popup stating "Attention: There is no network connection right now. Please try again later." on startup.  Attempting to view any type of information from youtube (e.g., "favorites" or "most viewed" lists, not just videos) causes this same error to be displayed.
The Google+ app can retrieve and display Notifications or members of my Circles just fine, but attempting to view posts leads to a long "Loading..." display, followed by "Google+ connection lost."
Searching and browsing work properly in the Android Marketplace app, but any attempt to install or update apps results in the downloads almost immediately going into "Download paused" status and staying there for hours, aside from the occasional attempt to restart the download (which invariably ends in re-pausing it), until I kill the Marketplace app.


Despite this, other apps work just fine - Browser will run searches and bring up pages, the Google Calendar widget updates properly, etc.  These results are consistent regardless of whether I am on a 3G or wi-fi network.  "Data traffic" is enabled under Mobile Network Settings.  Both "Background data" and "Auto-sync" are enabled in Accounts &amp; Sync Settings.

What do I need to do to get this working again?
Try this:

Menu > Settings > Wireless &amp; Networks > Mobile Networks > Data Enabled (that should be checked).

Menu > Settings > Wireless &amp; Networks > Mobile Networks > Access Point Names, hit menu, tap on 'Reset to default' :)