Program: 99244
Project: 99244
Buggy source:
private boolean negotiate(final Request request,final Response response,final AuthorizationHeader authorizationHeader){
  final String securityPackage=authorizationHeader.getSecurityPackage();
  final String connectionId=NtlmServletRequest.getConnectionId(request);
  this.log.debug("String_Node_Str",securityPackage,connectionId);
  final boolean ntlmPost=authorizationHeader.isNtlmType1PostAuthorizationHeader();
  if (ntlmPost) {
    this.auth.resetSecurityToken(connectionId);
  }
  IWindowsSecurityContext securityContext;
  try {
    final byte[] tokenBuffer=authorizationHeader.getTokenBytes();
    this.log.debug("String_Node_Str",Integer.valueOf(tokenBuffer.length));
    securityContext=this.auth.acceptSecurityToken(connectionId,tokenBuffer,securityPackage);
    this.log.debug("String_Node_Str",Boolean.valueOf(securityContext.isContinue()));
    final byte[] continueTokenBytes=securityContext.getToken();
    if (continueTokenBytes != null && continueTokenBytes.length > 0) {
      final String continueToken=BaseEncoding.base64().encode(continueTokenBytes);
      this.log.debug("String_Node_Str",continueToken);
      response.addHeader("String_Node_Str",securityPackage + "String_Node_Str" + continueToken);
    }
    if (securityContext.isContinue() || ntlmPost) {
      response.setHeader("String_Node_Str","String_Node_Str");
      response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
      response.flushBuffer();
      return false;
    }
  }
 catch (  IOException e) {
    this.log.warn("String_Node_Str",e.getMessage());
    this.log.trace("String_Node_Str",e);
    sendUnauthorized(response);
    return false;
  }
  final IWindowsIdentity windowsIdentity=securityContext.getIdentity();
  if (!this.allowGuestLogin && windowsIdentity.isGuest()) {
    this.log.warn("String_Node_Str",windowsIdentity.getFqn());
    sendUnauthorized(response);
    return false;
  }
  try {
    this.log.debug("String_Node_Str",windowsIdentity.getFqn(),windowsIdentity.getSidString());
    final GenericWindowsPrincipal windowsPrincipal=new GenericWindowsPrincipal(windowsIdentity,this.context.getRealm(),this.principalFormat,this.roleFormat);
    this.log.debug("String_Node_Str",windowsPrincipal.getRolesString());
    final HttpSession session=request.getSession(true);
    this.log.debug("String_Node_Str",session.getId());
    register(request,response,windowsPrincipal,securityPackage,windowsPrincipal.getName(),null);
    this.log.info("String_Node_Str",windowsPrincipal.getName());
  }
  finally {
    windowsIdentity.dispose();
  }
  return true;
}

Fixed version (ground truth):
private boolean negotiate(final Request request,final Response response,final AuthorizationHeader authorizationHeader){
  final String securityPackage=authorizationHeader.getSecurityPackage();
  final String connectionId=NtlmServletRequest.getConnectionId(request);
  this.log.debug("String_Node_Str",securityPackage,connectionId);
  final boolean ntlmPost=authorizationHeader.isNtlmType1PostAuthorizationHeader();
  if (ntlmPost) {
    this.auth.resetSecurityToken(connectionId);
  }
  IWindowsSecurityContext securityContext;
  try {
    final byte[] tokenBuffer=authorizationHeader.getTokenBytes();
    this.log.debug("String_Node_Str",Integer.valueOf(tokenBuffer.length));
    securityContext=this.auth.acceptSecurityToken(connectionId,tokenBuffer,securityPackage);
    this.log.debug("String_Node_Str",Boolean.valueOf(securityContext.isContinue()));
    final byte[] continueTokenBytes=securityContext.getToken();
    if (continueTokenBytes != null && continueTokenBytes.length > 0) {
      final String continueToken=BaseEncoding.base64().encode(continueTokenBytes);
      this.log.debug("String_Node_Str",continueToken);
      response.addHeader("String_Node_Str",securityPackage + "String_Node_Str" + continueToken);
    }
    if (securityContext.isContinue() || ntlmPost) {
      response.setHeader("String_Node_Str","String_Node_Str");
      response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
      response.flushBuffer();
      return false;
    }
  }
 catch (  IOException e) {
    this.log.warn("String_Node_Str",e.getMessage());
    this.log.trace("String_Node_Str",e);
    sendUnauthorized(response);
    return false;
  }
  final IWindowsIdentity windowsIdentity=securityContext.getIdentity();
  if (!this.allowGuestLogin && windowsIdentity.isGuest()) {
    this.log.warn("String_Node_Str",windowsIdentity.getFqn());
    sendUnauthorized(response);
    return false;
  }
  try {
    this.log.debug("String_Node_Str",windowsIdentity.getFqn(),windowsIdentity.getSidString());
    final GenericWindowsPrincipal windowsPrincipal=new GenericWindowsPrincipal(windowsIdentity,this.context.getRealm(),this.principalFormat,this.roleFormat);
    this.log.debug("String_Node_Str",windowsPrincipal.getRolesString());
    final HttpSession session=request.getSession(true);
    this.log.debug("String_Node_Str",session == null ? "String_Node_Str" : session.getId());
    register(request,response,windowsPrincipal,securityPackage,windowsPrincipal.getName(),null);
    this.log.info("String_Node_Str",windowsPrincipal.getName());
  }
  finally {
    windowsIdentity.dispose();
  }
  return true;
}