could not connect to <server> (Interrupted system call).

set imap_user = "user"
set imap_pass = "password"
set folder = "imap://user@server:143"
set spoolfile = "+INBOX"
mailboxes         = +INBOX
set ssl_starttls=yes
set header_cache = ~/.mutt/<path>
set message_cachedir = ~/.mutt/<path>
set certificate_file = ~/.mutt/<path>
unset imap_passive
set imap_keepalive = 300
set mail_check = 120
set smtp_url = "smtp://user@server:587/"
set smtp_pass = "password"
set from="user@mail.com"
set use_from=yes
set realname = "myname"
set postponed = "+[folder]/Drafts"


set sort = reverse-date-received
color index red default ~P
set editor=vim