CYRUS/imaps[92001]: SASL cannot connect to saslauthd server: Permission denied

[James B Byrne]

FreeBSD-11.2p7 

I just upgraded the packages on our cyrus_imap server host and now we cannot authenticate to read or send email.  We use squirrel-mail exclusively and connect directly from the SM host to the IMAP host.  The error message we are receiving is the subject line but I repeat it here for completeness.

CYRUS/imaps[92001]: SASL cannot connect to saslauthd server: Permission denied

The only thing that changed was the pkg upgrades on the IMAP and SM hosts.  The failure to authenticate errors commenced immediately following.

I am using this temporary email address because, obviously, I cannot read anything that arrived to my existing mailboxes.  Likewise, this is somewhat urgent.  I have been investigating this for the better part of three hours and have gotten nowhere.

Any helpful advice is most welcome.