Exchange Server 2019 ECP/OWA Not Working

Study this article if you can’t access Exchange Server 2019 ECP(Exchange Control Panel) or OWA(Outlook Web Access).

In your Exchange Server Infrastructure, if your ECP/OWA console doesn’t open and you encounter EventID:1309 in the Application Log, the root cause of the problem is the missing SharedWebConfig file.
You can see this in the “Application Virtual Path” – “Application Path” in Event ID 1309.

To resolve this issue follow these steps:

Access the server with the problem.
Generate the missing file:
- Run cd %ExchangeInstallPath%\bin to change the current directory to the bin folder that’s under the Exchange installation path.
- Use the DependentAssemblyGenerator.exe tool
- If the file is missing from C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy, run the following command:
  - DependentAssemblyGenerator.exe -exchangePath "%ExchangeInstallPath%\bin" -exchangePath "%ExchangeInstallPath%\FrontEnd\HttpProxy" -configFile "%ExchangeInstallPath%\FrontEnd\HttpProxy\SharedWebConfig.config"

IISReset

You can now access ECP!

P.S: If you encounter EventID:1309, carefully check its contents.
Because in the problem I mentioned above, the issue was related to the ECP.
EventID contents; “Application Virtual Path: /ecp” and “Application Path: C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\ecp“

If these contents are as follows;

Application Virtual Path: /owa
Application Path: C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\owa\

To resolve this issue follow these steps:

Access the server with the problem.
Generate the missing file:
- Run cd %ExchangeInstallPath%\bin to change the current directory to the bin folder that’s under the Exchange installation path.
- Use the DependentAssemblyGenerator.exe tool
- If the file is missing from C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess, run the following command:
  - DependentAssemblyGenerator.exe -exchangePath "%ExchangeInstallPath%\bin" -exchangePath "%ExchangeInstallPath%\ClientAccess" -configFile "%ExchangeInstallPath%\ClientAccess\SharedWebConfig.config"