"failed to expand condition" in exim4 paniclog
 

after a long time of working without problems, become many failures in paniclog every few minutes

failed to expand condition "${if and{{exists{/usr/local/ispmgr/var/eximquota.pid}}{match{${readsocket{/usr/local/ispmgr/var/eximquota.sock}{$local_part@$domain:$message_size} }}{\Nover quota\N}}}{yes}{no}}" for quota_check router: failed to connect to socket /usr/local/ispmgr/var/eximquota.sock: Connection refused inside "and{...}" condition

i hava changed nothing, what is wrong?

Debian
with ISPmanager-Pro 4.4.10.20

Hello.
In the Exim configuration file change {exists{/usr/local/ispmgr/var/eximquota.sock}}\ into {exists{/usr/local/ispmgr/var/eximquota.pid}}\ to make Exim check the process by pid, rather then by socket.