SMB1: SessionSetupHelper: Invalid NTLM flag was set (and ignored) in some cases

SMBLibrary/Server/SMB1/SessionSetupHelper.cs

@@ -144,7 +144,6 @@ namespace SMBLibrary.Server.SMB1
             authenticateMessage.NegotiateFlags = NegotiateFlags.UnicodeEncoding |
                                                  NegotiateFlags.OEMEncoding |
                                                  NegotiateFlags.Sign |
-                                                 NegotiateFlags.LanManagerKey |
                                                  NegotiateFlags.NTLMSessionSecurity |
                                                  NegotiateFlags.AlwaysSign |
                                                  NegotiateFlags.Version |
@@ -155,6 +154,10 @@ namespace SMBLibrary.Server.SMB1
             {
                 authenticateMessage.NegotiateFlags |= NegotiateFlags.ExtendedSessionSecurity;
             }
+            else
+            {
+                authenticateMessage.NegotiateFlags |= NegotiateFlags.LanManagerKey;
+            }
             authenticateMessage.UserName = accountNameToAuth;
             authenticateMessage.LmChallengeResponse = lmChallengeResponse;
             authenticateMessage.NtChallengeResponse = ntChallengeResponse;