long SSL handshakes on pop3s

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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