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Setup or Renew a CA Signing Certificate
In Salesforce
1. Setup > Security > Certificate and Key Management
2. Click on the label name of your existing Certificate
3. Click "Download Certificate Signing Request"
4. Deliver this to your External Certificate Authority (CA) or to your IT Department to send it for you.
5. CA sends back a new valid cert with new dates
6. From the same page in Step 3, Click "Update Signed Certificate"
7. Upload your new .crt file and click Save.
8. Notice your new expiration date. (if there is a problem with the updated CRT, the upload will fail)