Roundcube error "Connection to storage server failed" after updating to cPanel version 132

Symptoms

After updating to cPanel version 132, Roundcube logins no longer function, when reviewing the Dovecot system logs you find errors like the following:

CONFIG_TEXT: dovecot[820108]: auth: Fatal: passdb-lua: script_init() failed: lua_pcall(/usr/local/cpanel/etc/dovecot/cpauthd.lua) failed: /usr/local/cpanel/etc/dovecot/cpauthd.lua:14: module 'socket' not found:
dovecot[820108]: auth: Fatal: #011no field package.preload['socket']
dovecot[820108]: auth: Fatal: #011no file '/usr/share/lua/5.3/socket.lua'
dovecot[820108]: auth: Fatal: #011no file '/usr/share/lua/5.3/socket/init.lua'
dovecot[820108]: auth: Fatal: #011no file '/usr/lib64/lua/5.3/socket.lua'
dovecot[820108]: auth: Fatal: #011no file '/usr/lib64/lua/5.3/socket/init.lua'

When checking the lua-socket package using rpm you see the release is still el7 despite the server being el8/el9:

# rpm -qi lua-socket
Name        : lua-socket
Version     : 3.1.0
Release     : 1.el7

Cause

This looks to be primarily caused by an el7 package "lua-socket" surviving the elevate from CentOS 7 to AlmaLinux 8 without being replaced by the AlmaLinux 8 version of this package.

We've opened an internal case for our development team to investigate this further. For reference, the case number is CPANEL-50686. Follow this article to receive an email notification when a solution is published in the product. 

Resolution

1. Replace the EL7 package with the correct version:

# yum --allowerasing install lua-socket-3.0-0.17.rc1.el8.x86_64

2. If Imunify360 is installed, check the repo file:

# cat /etc/yum.repos.d/imunify360.repo

If baseurl contains a hardcoded el/7/ path, update it to use the dynamic release variable:

CONFIG_TEXT: [imunify360]
name=EL-$releasever - Imunify360
baseurl=https://repo.imunify360.cloudlinux.com/defense360//el/$releasever/updates/x86_64/
enabled=1
gpgcheck=1
gpgkey=https://repo.imunify360.cloudlinux.com/defense360//RPM-GPG-KEY-CloudLinux

3. Run a distrosync on the lua-socket package. This may show it being downgraded, but the package should still include Lua Socket 5.3.

# dnf distrosync lua-socket

4. Restart Dovecot and verify:

# /scripts/restartsrv_dovecot