Problems with mailing programme error... System.IO.IOException: The handshake failed due to an unexpected packet format.

Question

As of a couple of days ago I have been receiveing the following error message, I do not remember changing any settings or downloading any programmes.  What needs to be done to correct this.....

Unable to connect to mail server(s). Please specify a valid mail server, server properties, or check your network connection. The following exception was also recorded: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.IO.IOException: The handshake failed due to an unexpected packet format.

   at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)

   at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)

   at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)

   at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)

   at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)

   at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)

   at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)

   at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost)

   at AdvancedIntellect.Ssl.SslSocket.StartTLS()

   --- End of inner exception stack trace ---

   at aspNetEmail.EmailMessage.?(String )

   at aspNetEmail.EmailMessage.?()

Answer 1

I'd probably try disabling the e-mail scanning function of Norton (which may require uninstalling/reinstalling Norton without that feature) as it can sometimes cause problems.

Have you tried contacting Email Sender Deluxe support?

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-B-

http://www.officeforlawyers.com | http://www.onenote-tips.com

Author: The Lawyer's Guide to Microsoft Outlook

Answer 2

Thanks for the hint. Yes it seems to be a problem with the Norton settings.

Answer 3

The anti-virus is Norton 360.

They are being sent via Email Sender Deluxe as personalised emails to a list of 8 people.

Answer 4

What e-mail client are you using?  Outlook?  Windows Live Mail?  Thunderbird?  Something else?

What anti-virus software are you using?

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-B-

http://www.officeforlawyers.com | http://www.onenote-tips.com

Author: The Lawyer's Guide to Microsoft Outlook