We have completed an upgrade to Ubuntu 20.04 LTS and Jira Server 8.5.5. and we have this issue in our system dashboard loading the Activity Stream plugin. We see the error message "gadget.common.error.500" whenever the gadget is loading.
We have Active Directory CA and we produced a wildcard cert for the JKS but we also included the root CA inside the JKS file and in /usr/local/share/ca-certificates/
running curl -v https://jira.ourdomain.com returns "SSL certificate verify ok" so we're quite sure the JKS file and the cert are ok.
We also tried to add the jira.ourdomain.com name in /etc/hosts with the internal IP address as was suggested somewhere and we tried to disable/enable the "Streams Plugin" and re-index and that didn't help either.
Please assist,
Noam.