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Recommended Connection state check?

I'm doing some testing for network errors..

Aspose.Email for .Net 4.0

version: 3.8.0.0

On a local newtork, then connect VPN to the company network

After I connect, I click on a button to check network state:

Try
LogLocally("Connection: " & oImapClient.ConnectionState.ToString)
Catch ex As Exception
LogLocally("Catch: " & ex.Message)
End Try

(works fine)

Then I diconnect VPN, recheck, the .ConnectionState call can not be trapped

System.IO.IOException was unhandled
HResult=-2146232800
Message=Unable to write data to the transport connection: An existing connection was forcibly closed by the remote host.
Source=System
StackTrace:
at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size)
at ‰..Write(Byte[] , Int32 , Int32 )
at ‰..Flush()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException: System.Net.Sockets.SocketException
HResult=-2147467259
Message=An existing connection was forcibly closed by the remote host
Source=System
ErrorCode=10054
NativeErrorCode=10054
StackTrace:
at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size)
InnerException:

Is there a safer way to ceck for the connection being open?

Thanks, Dave

Hi Dave,

Please accept my apologies for delayed response.

I have tried to reproduce the issue in my local environment and have not been able to reproduce the issue. Can you please guide us further for how to set up the desired test environment on our end with which you are able to reproduce the issue. Please share the feedback in this regard so that we may proceed to help you further.

Thanks and Best Regards,

On a local network

Connect to company network with VPN

Open connection to Exchange server

Check Conneciton

Drop VPN

Check Conneciton - causes failure 100% of the time

Hi Dave,


Thank you for the feedback.

It seems that the error may arise due to the network stream that is broken before tested for the connection state. We are currently in process of releasing Aspose.Email for .NET 3.9.0 that will take a couple of days more to be available for download and includes some improvements to the ImapClient as well. I would request you to please test this issue with the upcoming version and let us know your feedback then. We’ll further investigate it and assist you in this regard. Your cooperation is highly appreciated in this regard.

Great… let me know if you want it tested before then… Dave

Hi Dave,


Since the new release is already under QA process, we request you to please wait until the new release is published and available for testing at your end.

Any update on this? Or where I can find out?

Thanks.. Dave

Hi Dave,


Aspose.Email for .NET 4.1.0 is released and can be downloaded for testing. Could you please test your scenario with this latest version and let us know your feedback?

Thanks got it downloaded.. do you have an example of the order of the connecitons now?

I have this:

oImapClient = New ImapClient(Server, User, Password)
oImapClient.Connect(True)
oImapClient.SelectFolder(ImapFolderInfo.InBox)

But Connect says.. it's obsolete... examples still have it the 'old' way. Taking out the connect, errors in the SelectFolder call

Thansk.. Dave

Hi Dave,

The connect and Login methods are now obsolete and there is no need to use them. Could you please give it a try using the following code sample as it is working at my end. Please let us know your feedback then.

Sample Code:


ImapClient client = new ImapClient();

client.Host = "exchange.domain.com";

client.Username = "username";

client.Password = "password";

client.SelectFolder(ImapFolderInfo.InBox);

ImapMessageInfoCollection coll = client.ListMessages();

Console.WriteLine("Total Count: " + coll.Count);

foreach (ImapMessageInfo msgInfo in coll)

{

MailMessage msg = client.FetchMessage(msgInfo.UniqueId);

}

<w:LatentStyles DefLockedState=“false” DefUnhideWhenUsed=“true”
DefSemiHidden=“true” DefQFormat=“false” DefPriority=“99”
LatentStyleCount=“267”>
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UnhideWhenUsed=“false” QFormat=“true” Name=“Normal”/>
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UnhideWhenUsed=“false” QFormat=“true” Name=“heading 1”/>
<w:LsdException Locked=“false” Priority=“9” QFormat=“true” Name=“heading 2”/>
<w:LsdException Locked=“false” Priority=“9” QFormat=“true” Name=“heading 3”/>
<w:LsdException Locked=“false” Priority=“9” QFormat=“true” Name=“heading 4”/>
<w:LsdException Locked=“false” Priority=“9” QFormat=“true” Name=“heading 5”/>
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<w:LsdException Locked=“false” Priority=“39” Name=“toc 1”/>
<w:LsdException Locked=“false” Priority=“39” Name=“toc 2”/>
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UnhideWhenUsed=“false” QFormat=“true” Name=“Subtitle”/>
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<w:LsdException Locked=“false” Priority=“1” SemiHidden=“false”
UnhideWhenUsed=“false” QFormat=“true” Name=“No Spacing”/>
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UnhideWhenUsed=“false” Name=“Light Shading”/>
<w:LsdException Locked=“false” Priority=“61” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light List”/>
<w:LsdException Locked=“false” Priority=“62” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light Grid”/>
<w:LsdException Locked=“false” Priority=“63” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Shading 1”/>
<w:LsdException Locked=“false” Priority=“64” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Shading 2”/>
<w:LsdException Locked=“false” Priority=“65” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium List 1”/>
<w:LsdException Locked=“false” Priority=“66” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium List 2”/>
<w:LsdException Locked=“false” Priority=“67” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Grid 1”/>
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UnhideWhenUsed=“false” Name=“Medium Grid 2”/>
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UnhideWhenUsed=“false” Name=“Medium Grid 3”/>
<w:LsdException Locked=“false” Priority=“70” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Dark List”/>
<w:LsdException Locked=“false” Priority=“71” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful Shading”/>
<w:LsdException Locked=“false” Priority=“72” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful List”/>
<w:LsdException Locked=“false” Priority=“73” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful Grid”/>
<w:LsdException Locked=“false” Priority=“60” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light Shading Accent 1”/>
<w:LsdException Locked=“false” Priority=“61” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light List Accent 1”/>
<w:LsdException Locked=“false” Priority=“62” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light Grid Accent 1”/>
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UnhideWhenUsed=“false” Name=“Medium List 1 Accent 1”/>
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UnhideWhenUsed=“false” QFormat=“true” Name=“Quote”/>
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UnhideWhenUsed=“false” QFormat=“true” Name=“Intense Quote”/>
<w:LsdException Locked=“false” Priority=“66” SemiHidden=“false”
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UnhideWhenUsed=“false” Name=“Medium Grid 3 Accent 1”/>
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UnhideWhenUsed=“false” Name=“Dark List Accent 1”/>
<w:LsdException Locked=“false” Priority=“71” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful Shading Accent 1”/>
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UnhideWhenUsed=“false” Name=“Colorful List Accent 1”/>
<w:LsdException Locked=“false” Priority=“73” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful Grid Accent 1”/>
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UnhideWhenUsed=“false” Name=“Light Shading Accent 2”/>
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<w:LsdException Locked=“false” Priority=“62” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light Grid Accent 2”/>
<w:LsdException Locked=“false” Priority=“63” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Shading 1 Accent 2”/>
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<w:LsdException Locked=“false” Priority=“65” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium List 1 Accent 2”/>
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UnhideWhenUsed=“false” Name=“Medium List 2 Accent 2”/>
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UnhideWhenUsed=“false” Name=“Medium Grid 1 Accent 2”/>
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UnhideWhenUsed=“false” Name=“Medium Grid 2 Accent 2”/>
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UnhideWhenUsed=“false” Name=“Colorful Shading Accent 2”/>
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UnhideWhenUsed=“false” Name=“Colorful Grid Accent 2”/>
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UnhideWhenUsed=“false” Name=“Light Shading Accent 3”/>
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UnhideWhenUsed=“false” Name=“Light List Accent 3”/>
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UnhideWhenUsed=“false” Name=“Light Grid Accent 3”/>
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UnhideWhenUsed=“false” Name=“Medium Shading 1 Accent 3”/>
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UnhideWhenUsed=“false” Name=“Medium Shading 2 Accent 3”/>
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UnhideWhenUsed=“false” Name=“Medium List 1 Accent 3”/>
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UnhideWhenUsed=“false” Name=“Medium Grid 1 Accent 3”/>
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<w:LsdException Locked=“false” Priority=“62” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light Grid Accent 4”/>
<w:LsdException Locked=“false” Priority=“63” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Shading 1 Accent 4”/>
<w:LsdException Locked=“false” Priority=“64” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Shading 2 Accent 4”/>
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UnhideWhenUsed=“false” Name=“Medium List 1 Accent 4”/>
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UnhideWhenUsed=“false” Name=“Medium List 2 Accent 4”/>
<w:LsdException Locked=“false” Priority=“67” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Grid 1 Accent 4”/>
<w:LsdException Locked=“false” Priority=“68” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Grid 2 Accent 4”/>
<w:LsdException Locked=“false” Priority=“69” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Grid 3 Accent 4”/>
<w:LsdException Locked=“false” Priority=“70” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Dark List Accent 4”/>
<w:LsdException Locked=“false” Priority=“71” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful Shading Accent 4”/>
<w:LsdException Locked=“false” Priority=“72” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful List Accent 4”/>
<w:LsdException Locked=“false” Priority=“73” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful Grid Accent 4”/>
<w:LsdException Locked=“false” Priority=“60” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light Shading Accent 5”/>
<w:LsdException Locked=“false” Priority=“61” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light List Accent 5”/>
<w:LsdException Locked=“false” Priority=“62” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light Grid Accent 5”/>
<w:LsdException Locked=“false” Priority=“63” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Shading 1 Accent 5”/>
<w:LsdException Locked=“false” Priority=“64” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Shading 2 Accent 5”/>
<w:LsdException Locked=“false” Priority=“65” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium List 1 Accent 5”/>
<w:LsdException Locked=“false” Priority=“66” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium List 2 Accent 5”/>
<w:LsdException Locked=“false” Priority=“67” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Grid 1 Accent 5”/>
<w:LsdException Locked=“false” Priority=“68” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Grid 2 Accent 5”/>
<w:LsdException Locked=“false” Priority=“69” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Grid 3 Accent 5”/>
<w:LsdException Locked=“false” Priority=“70” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Dark List Accent 5”/>
<w:LsdException Locked=“false” Priority=“71” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful Shading Accent 5”/>
<w:LsdException Locked=“false” Priority=“72” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful List Accent 5”/>
<w:LsdException Locked=“false” Priority=“73” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful Grid Accent 5”/>
<w:LsdException Locked=“false” Priority=“60” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light Shading Accent 6”/>
<w:LsdException Locked=“false” Priority=“61” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light List Accent 6”/>
<w:LsdException Locked=“false” Priority=“62” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Light Grid Accent 6”/>
<w:LsdException Locked=“false” Priority=“63” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Shading 1 Accent 6”/>
<w:LsdException Locked=“false” Priority=“64” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium Shading 2 Accent 6”/>
<w:LsdException Locked=“false” Priority=“65” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium List 1 Accent 6”/>
<w:LsdException Locked=“false” Priority=“66” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Medium List 2 Accent 6”/>
<w:LsdException Locked=“false” Priority=“67” SemiHidden=“false”
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<w:LsdException Locked=“false” Priority=“68” SemiHidden=“false”
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<w:LsdException Locked=“false” Priority=“70” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Dark List Accent 6”/>
<w:LsdException Locked=“false” Priority=“71” SemiHidden=“false”
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<w:LsdException Locked=“false” Priority=“72” SemiHidden=“false”
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<w:LsdException Locked=“false” Priority=“73” SemiHidden=“false”
UnhideWhenUsed=“false” Name=“Colorful Grid Accent 6”/>
<w:LsdException Locked=“false” Priority=“19” SemiHidden=“false”
UnhideWhenUsed=“false” QFormat=“true” Name=“Subtle Emphasis”/>
<w:LsdException Locked=“false” Priority=“21” SemiHidden=“false”
UnhideWhenUsed=“false” QFormat=“true” Name=“Intense Emphasis”/>
<w:LsdException Locked=“false” Priority=“31” SemiHidden=“false”
UnhideWhenUsed=“false” QFormat=“true” Name=“Subtle Reference”/>
<w:LsdException Locked=“false” Priority=“32” SemiHidden=“false”
UnhideWhenUsed=“false” QFormat=“true” Name=“Intense Reference”/>
<w:LsdException Locked=“false” Priority=“33” SemiHidden=“false”
UnhideWhenUsed=“false” QFormat=“true” Name=“Book Title”/>
<w:LsdException Locked=“false” Priority=“37” Name=“Bibliography”/>
<w:LsdException Locked=“false” Priority=“39” QFormat=“true” Name=“TOC Heading”/>
</w:LatentStyles>
<![endif]–><!–[if gte mso 10]>

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Thanks for the example.. but, this does not work

the .SelectFolder call causes an exception, and no message is set on the Catch ex as Exception

going back to 3.8, adding the connect back in.. works fine

Hi Dave,


We are sorry for any inconvenience caused to you.


I have tested the scenario again using Aspose.Email for .NET 4.1.0 and found that above mentioned sample code is working fine. As you mentioned that you don’t get any exception, I would like to share that now Aspose has provided new feature for logging activity by ImapClient and Pop3Client similar to SmtpClient . You may please use this feature to log the activity as mentioned here and let us know your feedback. We will try to provide assistance as soon as possible in this regard.


Well.. we'll have to skip this upgrade then... thanks

Try
oImapClient.SelectFolder(ImapFolderInfo.InBox)
Catch ex As Exception

End Try

I just get ex.message = "ConnectFailure"

Hi Dave,

We recently identified an issue with default port number of IMAP client and that has been logged as NETWORKNET-34368 in our issue tracking system for further consideration by our development team. This issue was raised only when the ImapClient was initialized and used as follow:

ImapClient client = new ImapClient(“[exchange.aspose.com](http://exchange.aspose.com/)”, “asposeemail.test3”, “pwd”);

client.SelectFolder(ImapFolderInfo.InBox);

Other initializaitions of ImapClient didn’t raise this issue. The same may be the reason for the error that you are facing. I have linked this thread with the logged issue so that once the upcoming version of Aspose.Email for .NET is available, you’ll be notified and may test the issue.

We are sorry for the inconvenience caused to you in this regard.

The issues you have found earlier (filed as NETWORKNET-34368) have been fixed in this update.


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