After upgrade Centrestack, hit port binding error

Some times, after upgrade Centrestack, when access the web portal, hit port binding error, complaining about binding for port 80.

When hit the error, on Centrestack server, open browser and access the following two URLs:

http://localhost/namespace/n.svc/helloworld

http://localhost/storage/u.svc/helloworld

If everything is fine, the links should return message like:

In the port binding error, you may see error like:

Here, the error is in namespace. The file is GladCtrl64.dll_1137492390

On Centrestack server, go to the installation folder\portal\bin. By default, it is "C:\Program Files (x86)\Gladinet Cloud Enterprise\portal\bin". Here, you should find the file 'GladCtrl64.dll_1137492390'. Try to delete the file, or move it to other location outside the installation folder.

After that, retry the helloworld link. It should work. And web portal should allow login too.