[RCU] "An error occured! Server Error (OK)" non-descript error

Farhan Khan farhan at farhan.codes
Tue Feb 26 06:52:35 CET 2019

Hi all,

I am installing RoundCube, but am getting the non-descript error message "An
error occured! Server Error! (OK)" after I login. I am getting a list of
folders, but when I click on anything I receive that error popup, including
trying to logout.

>From my IMAP server, RoundCube appears to login, then immediately disconnect:
Feb 26 00:42:33 mail dovecot[32764]: imap-login: Login: user=<user>, method=PLAIN, rip=, lip=, mpid=18129, session=<zM4chsWCtPysEAAC>
Feb 26 00:42:33 mail dovecot[32764]: imap(user)<18129><zM4chsWCtPysEAAC>: Logged out in=12 out=445 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0

I am running tail -f /var/log/nginx/roundcube_error.log, but I do not get
anything new.

I am running this in a FreeBSD jail (container). The base system is
port-forwarding to the jail's IP which is running Roundcube. The jail is

I have set debug_level to 4, but do not know how to use this.

Please assist,

Farhan Khan
PGP Fingerprint: 1312 89CE 663E 1EB2 179C  1C83 C41D 2281 F8DA C0DE

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