The nickname should be the same that you specified for Certificate Alias while installing Identity Manager Exchange Service.
Now let's Import the server certificate from the connected eDirectory server and save it to a file in the pfx format.
To save the certificate to a file, click Save the exported certificate and rename as Exchangeazure.pfx (renaming is just for better understanding and not mandatory step)
As a verification step to check if the Exchange Service is running successfully open the following Exchange Service URL in your browser:
Replace the<Exchange_Service>with your Windows server ip address and :Port with the specified port number while installing Exchange Service.
After pasting the URL on browser it should look like below:
keytool -import -file <path to the Exchange cert file>\<ExchangeazurePublic.cer> -keystore <mykeystore> -alias <aliasname>
The <aliasname> should be the same as the Nickname provided earlier in Step 1 which is here "Exchangeazure"
<mykeystore> is any name we can provide to the java keystore.
Now this completes the steps to be followed to secure the connection between Exchange Service and IDM Azure AD driver