File preview hit 'Session has expired' error in iOS/macOS

Issue Description:

When attempting to preview files from the Centrestack web portal, shared links, or public links on iOS devices or Safari on macOS, users will encounter the error: "Refresh Page? Session has expired."
On iOS device:

Safari on macOS:

This issue is due to enhanced security features in iOS and macOS that block the file preview function.

Temporary Solutions:
. Use an Android device.
. Use Chrome browser on macOS.

Permanent Fix:

If your Centrestack server operates with only one worker node, the following procedure can resolve the issue:

1. Backup Configuration File:
   Navigate toC:\Program Files (x86)\Gladinet Cloud Enterprise\managementon the CentreStack server and create a backup of theWeb.configfile.

2. Modify Web.config:
   Open the originalWeb.configfile with Notepad. Find theappSettingssection around line 3:
   

   <appSettings>

             <add key="ChartImageHandler" value="storage=memory;deleteAfterServicing=true;"/>

   </appSettings>

   
   
   Add a new key named "GleamTechWeb:CookielessSessionMode" with a value of "Always". The final edited block will look like this:
   

   <appSettings>

            <add key="ChartImageHandler" value="storage=memory;deleteAfterServicing=true;"/>

            <add key="GleamTechWeb:CookielessSessionMode" value="Always" />

   </appSettings>

   
   
   Scroll down until you find a section called "sessionState" around line 54. It will look something like this:
   

   <sessionState mode="Custom" customProvider="GladSessionState">

           <providers>

                 <add name="GladSessionState" type="GladPageUILib.GladSessionState" />

           </providers>

   </sessionState>

   
   
   Change the entire sessionState block for the following:
             <sessionState mode="InProc" cookieless="true"></sessionState>
   
   Save web.config

3. Restart IIS and Test:
   Restart IIS to apply the changes. Then, test the file preview function to ensure the issue is resolved.