This article provides instruction on how to convert PFX certificate with importing password to PEM certificate in our document (using "Import PKCS#12" on GUI).
 Refer to Docs:  https://docs.netscaler.com/en-us/citrix-gateway/current-release/install-citrix-gateway/certificate-management-on-citrix-gateway/convert-pfx-certificate-to-pem.html

However, sometimes PFX certificate is created without importing password, for example, PFX certificate created from Azure App Service Certificate as below.

This kind of PFX certificate can't be convert to PEM and installed on ADC due to password requirement.

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Instructions

1. Upload PFX certificate into ADC.
2. From CLI , type "shell" command to open shell mode.
3. Export key and certificate file separately from PFX certificate.

-To export the private key without a passphrase or password.
Type: openssl pkcs12 -in filename.pfx -nocerts -nodes -out key.pem
 
 
-To export the Certificate
Type: openssl pkcs12 -in filename.pfx -clcerts -nokeys -out cert.pem

4. Install PEM format certificate and key files to Key pair from GUI, the password input will be skipped.

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eDoc:  https://docs.netscaler.com/en-us/citrix-gateway/current-release/install-citrix-gateway/certificate-management-on-citrix-gateway/convert-pfx-certificate-to-pem.html