I think that the output of https://updates.jenkins.io/latest/antisamy-markup-formatter.hpi?mirrorlist will show that your location may be served by multiple Jenkins mirrors.
You can then check each of the mirrors to identify if one of them is responding with an incorrect SSL certificate. It could also be that the JDK on your Jenkins controller or the ca-certificates package on your Jenkins controller are too old to recognize the September 2021 updates to Let's Encrypt root certificates. I suspect that Java 11.0.1+13-LTS on the controller likely indicates that the ca-certificates package is also similarly out of date (assuming you're running Linux). Update the packages on your controller so that you have the latest security fixes for Java and for the operating system. Mark Waite On Friday, November 19, 2021 at 10:26:26 AM UTC-7 you wrote: > Hello, > > When I try updating plugins, the very first plugin gets downloaded > successfully, but the subsequent ones fail to download. > > [image: Jenkins.png] > According to *Details* the SSL handshake fails due to a certificate error: > > -- You received this message because you are subscribed to the Google Groups "Jenkins Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to jenkinsci-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/cec5c693-b8b8-480e-9bad-262f16e401fdn%40googlegroups.com.
