Hi Guys
We've got a Zimbra 8.6 mail server that has one mailbox that cannot be authenticated against anymore via slapd after working fine for several years.
Repeated attempts to send mail to this mailbox from the internet crashes the whole server and requires it to be rebooted to start working again. If this mailbox receives no mail (or rather, no attempts are made to send mail to this mailbox) the server stays up and works fine for days on end.
The error in zimbra.log, when you try to send a mail to this mailbox is:
Code:
LDAP error: - unable to search ldap: An I/O error occurred while trying to read the response from the server: java.io.IOException: The element indicated that it required 20974932 bytes to hold the value, but this is larger than the maximum of 20971520 bytes that the client has been configured to accept
If you see this about ten or twenty times in the log, the slapd daemon dies - it apparently gets a SIGSEGV (not sure, it just ends and cannot be restarted short of rebooting the box.)
Anybody seen this before?
The strange thing is the box is three years old, tens of thousands of mails have been successfully sent and received via this one mailbox - but since January 2017 it emits the above error for that mailbox, and poking it enough with mail will take the server down.
Additionally, in the Zimbra web interface if you try to access this mailbox it crashes the browser with a 500 internal server error. Similar with Zimbra command line utilities, they emit the same error as above into the logs (message too large).
Any suggestions or ideas appreciated.
Thx
Stefan