UA Expert's User Change button doesn't work with the stack

[atimin]

I have a problem when I try to change a connected user with UA Expert.

Steps:

1. I implement authentication with the following handler-method:

	void
	Library::authenticationCallback(
			ApplicationAuthenticationContext* applicationAuthenitcationContext)
	{
		Log(Debug, "Event::authenticationCallback")
			.parameter("SessionId", applicationAuthenitcationContext->sessionId_);


		if (applicationAuthenitcationContext->authenticationType_ == OpcUaId_AnonymousIdentityToken_Encoding_DefaultBinary) {
			applicationAuthenitcationContext->statusCode_ = BadIdentityTokenRejected;
		}
		else if (applicationAuthenitcationContext->authenticationType_ == OpcUaId_UserNameIdentityToken_Encoding_DefaultBinary) {

			ExtensibleParameter::SPtr parameter = applicationAuthenitcationContext->parameter_;
			UserNameIdentityToken::SPtr token = parameter->parameter<UserNameIdentityToken>();

			// find user profile
			UserProfile::Map::iterator it;
			it = userMap_.find(token->userName());
			if ( it == userMap_.end()) {
				applicationAuthenitcationContext->statusCode_ = BadUserAccessDenied;
				return;
			}
			UserProfile::SPtr userProfile = it->second;

			// get password
			char* buf;
		    int32_t bufLen;
			token->password((OpcUaByte**)&buf, (OpcUaInt32*)&bufLen);
			if (bufLen <= 0) {
				applicationAuthenitcationContext->statusCode_ = BadUserAccessDenied;
				return;
			}
			std::string password(buf, bufLen);

			// check password
			if (password != userProfile->password_) {
				applicationAuthenitcationContext->statusCode_ = BadUserAccessDenied;
				return;
			}

			applicationAuthenitcationContext->userContext_ = userProfile;
			applicationAuthenitcationContext->statusCode_ = Success;
		}
		else if (applicationAuthenitcationContext->authenticationType_ == OpcUaId_X509IdentityToken_Encoding_DefaultBinary) {
			applicationAuthenitcationContext->statusCode_ = BadIdentityTokenRejected;
		}
		else {
			applicationAuthenitcationContext->statusCode_ = BadIdentityTokenInvalid;
		}
	}

2. My application have User_RW and User_R users
3. I connect as User_RW successfully
4. Click on User Change in context menu of server in UA Expert
5. Login as User_R
6. And have Error 'BadIdentityTokenInvalid' was returned during ActivateSession

PS:

Acctually if I try to change user on the same user User_RW, I get the same error.

Logs:

OpcUaServer.log
UAExpertChangeUser.log

[huebl]

The Activate Session Request in the current implementation can only occur if a Create Session Request has occurred directly before. This behavior needs to be changed.