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Resolution

You have different steps to resolve the issue:

Workaround for Firefox and Thunderbird: Disable DHE ciphers in the Zimbra Collaboration Server

Disabling the insecure ciphers, will make Firefox happy again:

zmprov mcf +zimbraSSLExcludeCipherSuites TLS_DHE_RSA_WITH_AES_128_CBC_SHA
zmprov mcf +zimbraSSLExcludeCipherSuites TLS_DHE_RSA_WITH_AES_256_CBC_SHA
zmmailboxdctl restart

Recommendeded Workaround: Upgrade ZCS

Luca







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