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Option 1: Screen output
Open the Exchange Management Shell
Execute the following command:
New-ExchangeCertificate -GenerateRequest -SubjectName "C=DE, O=Company name, cn=owa.yourdomain.de" -KeySize 2048 -PrivateKeyExportable $true
Customize the command to your needs and change the company name as well as the FQDN of your Exchange Server.
Alternatively, you can use the following command to include SANs (Subject Alternative Names) in the CSR:
New-ExchangeCertificate -GenerateRequest -SubjectName "C=DE, O=Company name, cn=owa.yourdomain.de" -DomainName owa.yourdomain.de, owa, autodiscover.yourdomain.de -PrivateKeyExportable $true
The CSR is displayed on the screen and can now be copied to the web form.
Option 2: File output
Open the Exchange Management Shell
Execute the following commands:
$CSR = New-ExchangeCertificate -GenerateRequest -SubjectName "C=DE, O=Company name, cn=owa.yourdomain.de" -PrivateKeyExportable $true
Set-Content -Path "C:\Exchangecertreq.txt" -Value $CSR
In the given path, in this example directly in the root directory of drive C:, there is the data named Exchangecertreq.txt. Please insert the contents of the file into the web form.