Hang on StartTls if connected to a server that doesn't support STARTTLS

[Kim-SSi]

When connecting to an OpenLDAP instance running without STARTTLS and trying to do a StartTls the process hangs at:

Novell.Directory.Ldap.NETStandard/src/Novell.Directory.Ldap.NETStandard/MessageAgent.cs

Line 354 in e4f2934

Monitor.Wait(_messages);

To bypass this I have altered the line to:

Monitor.Wait(_messages, 5000);

This might cause other unforeseen issues. Ideally this should be set to the timeout value instead of a hard coded value. Both of these concerns is why I have not created a pull request.

I am checking for STARTTLS support via the RootDSE supportedExtension but unfortunately not all servers expose the capability when it is supported. And some users want to use that configuration with their servers.

[Kim-SSi]

Should the other Monitor.Wait without timeout be changed to include a timeout so that it can't possibly hang?

Novell.Directory.Ldap.NETStandard/src/Novell.Directory.Ldap.NETStandard/Message.cs

Line 208 in e4f2934

Monitor.Wait(_replies);

There already is a timeout value in the Message class.

Monitor.Wait(_replies, _mslimit);