On 23 Jun 2021, at 11:58, adamw@xxxxxxxxxxxxxxxxx wrote:
> The mail server is an old Postfix(2.9.6)/Cyrus(2.4.16) stack.
>
> I access emails from 4 different Thunderbird clients using either VPN or SSH port forwarding which gives up to 8 combinations in total.
>
> When switching I often see:
>
> "Unable to connect to your IMAP server.
> You may have exceeded the maximum number of connections to this server.
> If so use the Advanced IMAP Server Settings dialog to reduce the number of cached connections."
>
> I have already tried reducing the maximum number of server connections to cache from 5 to 1 across all clients and waited 24 hours before reconnecting but the issue didn't go away.
>
> My question: where do I find an option to slightly increase the limit on server side and what is it called?
>
> I've already looked into cyrus.conf, imapd.conf and few other places but couldn't find any obvious setting.
It is possible to limit the number of IMAP process in /etc/cyrus.conf. Do you have any lines with “maxchild=“?
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