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Blixt
Newbie
Joined: 24 August 2009
Location: Sweden
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Posts: 10
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| Posted: 26 August 2009 at 6:27am | IP Logged
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Hi there,
I've got an Imap object idling for a longer
period of time using the BeginIdle method.
Sometimes, the connection is interrupted,
causing a
MailBee.MailBeeAbortedByRemoteHostException
exception. While I can see the error before it
occurs using the ErrorOccurred event, I cannot
handle the exception (i.e., reconnect.) Instead,
the application crashes. The code that throws
the exception is in a thread created by the
MailBee.NET code so I can't catch it.
Should I create my own thread that does idling
using Idle, or is there a way to handle the
exception?
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Igor
AfterLogic Support
Joined: 24 June 2008
Location: United States
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Posts: 6044
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| Posted: 26 August 2009 at 6:39am | IP Logged
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The main reason of the issue is that IMAP server will stop idling and will close connection if idling is active for too long time (29 mins is default limit). Thus, we suggest to add a timer-based handler which performs reconnection to IMAP server, say, every 15-20 mins.
Regarding handling exceptions of asynchronous methods, you'll find an example on this documentation page; the approach assumes using callback function with a try/catch block.
--
Regards,
Igor, AfterLogic Support
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Blixt
Newbie
Joined: 24 August 2009
Location: Sweden
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Posts: 10
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| Posted: 26 August 2009 at 6:43am | IP Logged
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Yeah, in this case it was the timeout (after
exactly 35 minutes), but I want to make my code
safe even if the network connection goes down or
something like that. I will implement a
reconnection every 20 minutes or so.
Okay, so is it safe to assume that all
exceptions are thrown in the EndIdle method? So
no exceptions are thrown in the thread spawned
by BeginIdle?
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Igor
AfterLogic Support
Joined: 24 June 2008
Location: United States
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Posts: 6044
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| Posted: 26 August 2009 at 6:48am | IP Logged
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Yes, quite right. Note that BeginIdle may still cause exceptions connected to errors in the code, e.g. wrong method parameters or method call when there's no active connection to server.
--
Regards,
Igor, AfterLogic Support
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Blixt
Newbie
Joined: 24 August 2009
Location: Sweden
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Posts: 10
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| Posted: 26 August 2009 at 6:58am | IP Logged
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Okay! Thanks once again for your quick help! =)
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Blixt
Newbie
Joined: 24 August 2009
Location: Sweden
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Posts: 10
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| Posted: 02 September 2009 at 4:48am | IP Logged
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Hi again,
This code has been running fine for a few days
since I added periodical reconnection. I also
added try...catch in the EndIdle to handle
errors. However, a connection error occurred
recently that appears to be outside my code:
Code:
MailBee.MailBeeSocketObjectDisposedException:
The socket object used by MailBee was
unexpectedly closed. InnerException message
follows: ---> System.IO.IOException --->
System.Net.Sockets.SocketException
System.Net.Sockets.NetworkStream.Read(Byte[]
buffer, Int32 offset, Int32 size)
System.Net.Sockets.NetworkStream.Read(Byte[]
buffer, Int32 offset, Int32 size)
dr.a(Byte[] A_0, Int32 A_1)
dr.a(Exception A_0)
dr.a(Byte[] A_0, Int32 A_1)
c0.ak()
gx.u()
cx.e(Boolean A_0)
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Igor
AfterLogic Support
Joined: 24 June 2008
Location: United States
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Posts: 6044
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| Posted: 02 September 2009 at 5:06am | IP Logged
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To let us help you on this, please enable logging IMAP session into a file, reproduce the issue and provide us with the log file for examination.
--
Regards,
Igor, AfterLogic Support
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Blixt
Newbie
Joined: 24 August 2009
Location: Sweden
Online Status: Offline
Posts: 10
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| Posted: 06 September 2009 at 11:18pm | IP Logged
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Hello again. I enabled logging and here are the
last few lines before the error:
Code:
[10:48:55.39] [INFO] Will go idle.
[10:48:55.39] [SEND] MBN00000006 IDLE\r\n
[10:48:55.39] [RECV] + IDLE accepted, awaiting
DONE command.\r\n [Total 41 bytes received.]
[11:08:55.32] [INFO] Will finish idling.
[11:08:55.32] [SEND] DONE\r\n
[11:09:14.28] [INFO] Error: The socket object
used by MailBee was unexpectedly closed.
InnerException message follows: Det gick inte
att läsa data från transportanslutningen:
Anslutningsförsöket misslyckades eftersom den
anslutna datorn inte svarade inom en viss tid
eller på grund av att den etablerade
anslutningen till värddatorn inte längre
fungerar.
[11:09:14.32] [INFO] Will disconnect from host
"172.31.152.80".
[11:09:14.32] [INFO] Disconnected from host
"172.31.152.80". |
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The server is running in Swedish so the
exception is localized, but I'll try to
translate it: "Could not read data from the
transport connection: The connection attempt
failed due to the connected computer not
responding within a certain period of time or
because the established connection to the host
is no longer working."
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Alex
AfterLogic Support
Joined: 19 November 2003
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Posts: 2206
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| Posted: 07 September 2009 at 5:20am | IP Logged
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The world is unfair. Although IMAP RFC claims the server must support 30 minutes of idling, many servers ignore this and close the connection after just a few minutes. Your case, it seems. Try to lower the reconnection interval to 3 minutes.
Regards,
Alex
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Blixt
Newbie
Joined: 24 August 2009
Location: Sweden
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Posts: 10
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| Posted: 07 September 2009 at 5:44am | IP Logged
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Hello Alex,
The service usually works fine for a few days,
then a hiccup occurs which throws an exception
that I cannot catch. So it doesn't matter if I
reconnect every minute, the connection can
still break unexpectedly and in such a case I
have to handle the exception.
If this isn't possible I'll have to put the
connection handler on its own thread and
forcefully restart it as well to prevent the
main thread from crashing. But it would be
more convenient to be able to catch the
exception, since it's obviously caught by your
library before being passed on (but not to my
code, it seems?)
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Alex
AfterLogic Support
Joined: 19 November 2003
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Posts: 2206
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| Posted: 07 September 2009 at 6:10am | IP Logged
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This topic discusses handling exceptions in worker threads: Not receiving idle notifications
Regards,
Alex
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setven17
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Joined: 04 October 2009
Location: Philippines
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Posts: 2
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| Posted: 05 October 2009 at 1:41am | IP Logged
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whoa! at last I've come up on the solution. thanks even confusion took place before on the codes but it's okay now.
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tromby24
Newbie
Joined: 23 October 2009
Location: Philippines
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Posts: 2
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| Posted: 24 October 2009 at 2:12am | IP Logged
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Tengo un servidor IMAP objeto ralentí durante un largo
período de tiempo utilizando el método de BeginIdle.
A veces, se interrumpe la conexión,
causando una
MailBee.MailBeeAbortedByRemoteHostException
excepción. Aunque puedo ver el error antes de que
se produce utilizando el evento ErrorOccurred, no puedo
controlar la excepción (es decir, volver a conectar.) Por el contrario,
la aplicación se bloquea. El código que arroja
La excepción es en un hilo creado por el
Código MailBee.NET así que no puedo cogerlo.
¿Debo crear mi propio hilo que hace al ralentí
utilizando inactivo, o hay una manera de manejar la
excepción?
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