When you are using S-URL, you have a Connected App that uses a Self-Signed Certificate. These certificates expire. This page tells you how to update your certificate.
For initial S-URL Setup, see S-URL and Public Share Setup
To update your certificate, you’ll need to do the following steps, which are detailed below.
Create a new self-signed certificate
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Go to Setup > Security > Certificate and Key Management.
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Click on Create Self-Signed Certificate.
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Give it a label and the unique name. If you delete the expired certificate first, you can use the same name you used before. Otherwise give it a new name.
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Make sure the Exportable Private Key is checked.
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Click Save.
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Click on the certificate you just created.
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Click Download Certificate
Update the Custom Setting with the certificate name if needed
If you gave your certificate a new name, you need to update the custom setting where it’s stored. If you deleted the old certificate and are using the same name, skip this step.
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Go to Setup-->Custom Settings
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Find SDriveConfig and click Manage next to it
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Click Edit next to SUrl_Community_Certificate
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Enter the new name of your certificate
Upload the new certificate to your Connected App
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Go to Setup-->App Manager
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Find your SURL connected app. It probably has SURL in the name and the App Type is Connected
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Click the down arrow next to it and click Edit
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Click Choose a File
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Upload the certificate you downloaded in the first step
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Click Save
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You’ll get a message saying it can take up to 10 minutes. Click Continue
Your certificate is now updated.