Plesk Premium Antivirus can not be started: Plesk authorization failed: malformed response (no 'response=' field).

Benjamin Wessel

Updated January 15, 2021 20:42

kb: fixed kb: bug ABT: Group A Plesk Obsidian for Linux

Applicable to:

On attempting to start service Plesk Premium Antivirus in Plesk > Tools & Settings > Services Management the following error is shown:

PLESK_ERROR: Unable to start service: Unable to manage service by drwebmng: ('start', 'drweb'). Error: /opt/psa/admin/bin/drwebmng[16484]: Unable to start drweb antivirus daemon
Emails are not delivered
A paid license for Plesk Premium Antivirus is not installed in Plesk
Plesk update was installed recently

The following command returns empty output:

~]# curl -vv -d "challenge=123&checker=drweb" https://localhost:8443/check-plesk.php -k

The following error can be found in /var/log/syslog:

CONFIG_TEXT: Dec 1 06:39:06 mail drwebd[13260]: Plesk authorization failed: malformed response (no 'response=' field).
The following error may appear in /var/log/maillog:

CONFIG_TEXT: qmail-queue[42]: scan: scanning the message(drweb.tmp.p1QAZ) sent by janedoe@example.com to johndoe@example.com failed (error: -2)

Product issue:

#PPPM-12569 "Issued REST API secret keys now work again in Plesk Obsidian 18.0.31 and later."
Fixed in:
- Plesk Obsidian 09 December 2020 (Linux)

Please consider updating your server:

If update is not possible for some reason you may try the following

workaround

As a workaround, perform the following steps:

Log in to Plesk
Install Panel.ini editor extension
Go to Extensions > My extensions > Panel.ini editor > Edit and add the following value:

[panel]
realIpFrom = ""