Plesk and ASL update fails: [Errno 14] HTTPS Error 401 - Unauthorized – Plesk Help Center

Symptoms

Plesk update fails with the following message in /tmp/autoinstaller3.log:
PLESK_INFO: https://plesk_1234567_1:password@www4.atomicorp.com/channels/asl-4.0/centos/7/x86_64/repodata/repomd.xml: [Errno 14] HTTPS Error 401 - Unauthorized Trying other mirror. repo
Atomic Secure Linux extension is installed in Plesk.
Advanced ModSecurity Rules by Atomicorp (Security Pack) license is installed at Plesk > Tols & Settings > License Management > Additional License Keys
ASL config file at /etc/asl/config with authentication details to access Atomicorp repositories is regularly overwritten with wrong credentials.

Product issue:

#PPPM-8240 "Installation of a license for Advanced ModSecurity Rules by Atomicorp no longer overwrites installed Atomic Secured Linux license."
Fixed in:
- Plesk Obsidian (RC1 18.0.15 as #PPP-35935) 04 June 2019 (Linux)

Consider upgrading to Plesk Obsidian:

Workaround

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

temporary solution

Download the patched key-handler.zip file from the attachments to the server and unzip it:
# wget https://plesk.zendesk.com/hc/article_attachments/360002982634/key-handler.zip
# unzip key-handler.zip
Replace the original file with the new one at /usr/lib64/plesk-9.0/:
# mv -i /usr/lib64/plesk-9.0/key-handler /usr/lib64/plesk-9.0/key-handler.orig
# cp key-handler /usr/lib64/plesk-9.0/key-handler
# chmod 750 /usr/lib64/plesk-9.0/key-handler

Note: revert the changes if it is planned to use Modsecurity instead of ASL.