long SSL handshakes on pop3s

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Hi!

For some reasons, one user, who fetches emails via pop3s (20 accounts
per "batch"), has sometimes to fight with long SSL handshakes for about
14 seconds.


Mar 19 04:09:24 imap01 cyrus/pop3s[8032]: accepted connection
Mar 19 04:09:24 imap01 cyrus/pop3s[8032]: SSL_accept() incomplete ->
wait

[14 seconds nothing]

Mar 19 04:09:38 imap01 cyrus/pop3s[8032]: SSL_accept() incomplete ->
wait
Mar 19 04:09:38 imap01 cyrus/pop3s[8032]: SSL_accept() succeeded ->
done
Mar 19 04:09:38 imap01 cyrus/pop3s[8032]: starttls: TLSv1 with cipher
AES256-SHA (256/256 bits new) no authentication
Mar 19 04:09:38 imap01 cyrus/pop3s[8032]: login: host.xyz.net [x.x.x.x]
user001 plaintext+TLS User logged in SESSIONID=<cyrus-8032-1616123364-
Mar 19 04:10:37 imap01 cyrus/pop3s[8032]: USAGE user001 user: 0.004000
sys: 0.004000
Mar 19 04:10:37 imap01 cyrus/pop3s[8032]: counts: retr=<1> top=<1>
dele=<1>


The strange thing is, that when it happens, it's always 14 seconds
delay. popminpoll is set to 0, maxchild for pop3s is set to 100. I
don't see the problem with other users, not even if both of them are
connected to the same pop3s child. Server is not running under load.
Any ideas?

Cheers
Marcus



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