Our users are getting this message after upgrade Chrome to v45, and can't access JIRA (v5.2.4). This link from Google explains the reason: https://www.chromium.org/administrators/err_ssl_weak_server_ephemeral_dh_key?&hl=en-US
What's the exact procedure to fix this problem in JIRA?
This issue is not JIRA, but is instead the SSL/TLS certificate used to secure HTTPS connections.
You will need to re-generate your certificate with a larger key size (e.g. greater than 2048-bits rather than smaller sizes) and have the Certificate Authority (CA) sign the certificate.
This is not actually true. There are configurations that need to be changed in the Tomcat server.xml in regards to the cyphers and protocols used for the connection. I was able to resolve the issue with the following instructions without changing my certificate: https://confluence.atlassian.com/display/JIRAKB/Server+has+a+weak,+ephemeral+Diffie-Hellman+public+key
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