Getting warning "The Currently installed SSL certificate for this gateway expires.." upon logging in to Policy Manager

Document ID : KB000127833
Last Modified Date : 21/02/2019
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Issue:
We are getting this warning message whenever we're logging in to the Policy Manager:

The Currently installed SSL certificate for this gateway expires Wed, 27 Feb 2019

What does it mean and how to fix it?
Environment:
Layer7 API Gateway 9.x
Cause:
The warning message indicates that the Gateway's default SSL certificate is expiring on the stated date.
Resolution:
To replace the expiring certificate, please follow these instructions:

1) Create a new private key

2) If the certificate needs to be signed by a Certificate Authority (CA), generate a CSR and deliver it to the corresponding CA.  
   Once the certificate is signed by the CA, update the Gateway with this newly signed certificate.
  (Note: You can skip these steps if it is a self-signed certificate.)

3) Set the private key as the default ssl key

4) Restart the Gateway