Recently PayPal is requiring servers to support SHA-256. Here's an article referring to this issue:
At the top of the article, it states,
Update your integration to support certificates using the SHA-256 algorithm. PayPal is upgrading SSL certificates on all Live and Sandbox endpoints from SHA-1 to the stronger and more robust SHA-256 algorithm.
We have a dedicated CentOS server with numerous sites, mostly WordPress. Quite a few use PayPal IPN but do not have dedicated IPs or SSL Certificates. What needs to be changed to the server so these sites will support SHA-256? Our server is situated with Limestone Networks so I've created a ticket and asked repeatedly for assistance to no avail. They keep repeating SSL's need to be updated on the server. Would that be a wildcase SSL certificate in the usage case I described? Any assistance would be greatly appreciated.