How to update the certificate on Citrix ADC when the certificate is expired.

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Instructions

Under Traffic Management > SSL > Certificates > Server Certificates
1. Edit the certificate which is expired or about to expire
2. Select Update
3. Select Update Certificate and Key
4. Upload the new Certificate and the respective ssl keys that was used to create the certificate
5.Click on OK
6. Ensure that the Root and the Intermediate certificates are present on the ADC for linking with the server certificate which was updated.
7. If not kindly install the Root and all the Intermediate certificates under Traffic Management > SSL > Certificates > CA Certificates using the option install.
8. Post installation kindly link Server certificate to the intermediate certificate and intermediate to the root certificate. Note : Certificate bindings are automatically taken care when we use "Update" option

If we come across the error  "Invalid private key, or PEM pass phrase required for this private key" while installing the server certificate please refer https://support.citrix.com/article/CTX134233/.