Linux System.DirectoryServices.Protocols: does the library support multiple server connection?

[isupovs]

If I create a connection and try to send request from Windows computer, then shut down the dc1 and resend the request it will succeed. I assume it will use the dc2.

var ldi = new LdapDirectoryIdentifier(new [] { "dc1.domain.com",  "dc2.domain.com" }, 389, false, false);
var conn = new LdapConnection(ldi, new NetworkCredential("user", "password")) 
{
    SessionOptions = {
      ProtocolVersion = 3
    }, 
    AuthType = AuthType.Basic
};

var req = new SearchRequest("", "(objectType=*)", SearchScope.Base, "defaultNamingContext");
conn.SendRequest(req);

If the same code executes on Linux machine it will fail with System.DirectoryServices.Protocols.LdapException: The operation was aborted because the client side timeout limit was exceeded.
Does it depend on OpenLDAP library? Can I achieve the same result on Linux?

[buyaa-n]

@isupovs which version are you using? This might have fixed with #79653. Could you try it out with .NET 8.0?

[isupovs]

I use .NET6. I've tried with .NET8. It has the same behavior. Windows version reconnects to the second DC while Linux one just throws an exception.

[buyaa-n]

Does it depend on OpenLDAP library? Can I achieve the same result on Linux?

Not sure, somebody needs to dig into it. Could be a bug in our library.

[hangy]

There doesn't seem to be any OS-specific retry/failover logic in LdapConnection.Linux.cs or LdapConnection.Windows.cs. It seems likely that wldap32.dll implements some failover while OpenLDAP doesn't.