Peridiocally all IMAP/POP3 authentication will fail and I will see the following errors in the Zimbra logs..
Jan 20 14:31:19 mail saslauthd: authentication against url 'https://mail.domain.com:7071/service/admin/soap/'
caused error 'curl_easy_perform: error(28): SSL connection timeout'
Jan 20 14:31:19 mail saslauthd: url 'https://mail.domain.com:7071/service/admin/soap/' will not be used for (
at least) 600 seconds
Jan 20 14:31:19 mail saslauthd: Authentication cycle re-elected url https://mail.domain.com:7071/service/admi
n/soap/, giving up ...
Jan 20 14:31:19 mail saslauthd: auth_zimbra: email@example.com auth failed: curl_easy_perform: error(28): SSL c
(I replaced our domain with domain.com in these logs btw.)
I don't know what is causing this. I read in another old thread that it's due to SSL certificates, but they're all valid and none of them are expired. Anyone know what's going on?