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The selected authentication mechanism is not supported

Topics: Help requests
Jan 27, 2015 at 1:12 PM
Hi,

I have successfully established a connection to an exchange server but encounter the following exception when attempting a Login:

"The selected authentication mechanism is not supported"

The exchange is a pretty standard TLS, I have tried several different protocols in the ImapClient parameters to no prevail.

extracted code:
_client = new ImapClient(_mailServer, 143 SslProtocols.Tls, false);
_client.Connect();

if (_client.IsConnected)
{
   _client.Login(_login, _password);
}
On execution of _client.Login it throws "The selected authentication mechanism is not supported"?

Any ideas?
Jun 9, 2015 at 11:15 PM
I had same issue but I found my Server had a capability 'STARTTLS' for which we should send command 'STARTTLS' before LOGIN.

Can you paste your capability before you login?