On 8/30/19 5:52 AM, Gary Stainburn wrote: > Incidentally, the*good* server that I was referencing my broken server against has decided to start giving the curl certificate errors in the same way that the broken one did. Very strange. I ran It's possible that the error is unrelated to the ca-certificates file. You'll only see it if yum selects a mirror that uses a Let's Encrypt or Amazon-signed certificate (at least, those were the CAs for the hosts I saw you report errors for). If yum happens to select mirrors that don't, then everything will work normally. Reinstalling the package on the original system may have been coincidental.