This problem is happening on a Samsung running OS 4.4.4, and a Droid Turbo
running OS 5.1.
This problem occurs using IMAP with both polling or IDLE.
This problem occurs on 3G, 4G, and multiple internet connections.
This problem occurs with multiple e-mail providers.
If the connection is used every minute (either via e-mails coming in, going
out, etc., or by a poll or IDLE refresh), the connection is fine. If the
polling or IDLE refresh is set to anything longer than a minute, and no
e-mails come in or go out, the connection stops working.
Once the connection has gone unused for over a minute, any attempt to do
anything with the connection (poll, send e-mail, delete an existing email)
will cause K9 mail to hang up (the application still responds, but it is
stuck trying to communicate with the server).
I did force close K9 after waiting 25 minutes for it to give up trying to
communicate with the server and/or throw an error. Once it was force
stopped and re-opened, the following error was in the error folder:
java.net.SocketException: recvfrom failed: ETIMEDOUT (Connection timed out)
at libcore.io.IoBridge.maybeThrowAfterRecvfrom(IoBridge.java:592)
at libcore.io.IoBridge.recvfrom(IoBridge.java:556)
at java.net.PlainSocketImpl.read(PlainSocketImpl.java:485)
at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:37)
at
java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:237)
at java.io.InputStream.read(InputStream.java:162)
at java.io.BufferedInputStream.fillbuf(BufferedInputStream.java:149)
at java.io.BufferedInputStream.read(BufferedInputStream.java:234)
at
com.fsck.k9.mail.filter.PeekableInputStream.peek(PeekableInputStream.java:34)
at
com.fsck.k9.mail.store.ImapResponseParser.readResponse(ImapResponseParser.java:42)
at
com.fsck.k9.mail.store.ImapResponseParser.readResponse(ImapResponseParser.java:29)
at
com.fsck.k9.mail.store.ImapStore$ImapConnection.readStatusResponse(ImapStore.java:2775)
at
com.fsck.k9.mail.store.ImapStore$ImapConnection.executeSimpleCommand(ImapStore.java:2925)
at
com.fsck.k9.mail.store.ImapStore$ImapFolder.executeSimpleCommand(ImapStore.java:862)
at
com.fsck.k9.mail.store.ImapStore$ImapFolderPusher$1.run(ImapStore.java:3151)
at java.lang.Thread.run(Thread.java:818)
Caused by: android.system.ErrnoException: recvfrom failed: ETIMEDOUT
(Connection timed out)
at libcore.io.Posix.recvfromBytes(Native Method)
at libcore.io.Posix.recvfrom(Posix.java:185)
at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:250)
at libcore.io.IoBridge.recvfrom(IoBridge.java:553)
... 14 more
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