JetBackUp Installation Fails With "Can't connect to mongodb"

Symptoms

Trying to install the latest version of JetBackUp initially fails with the following error: 

jetapps —install jetbackup-cpanel stable
Log file: /usr/local/jetapps/var/log/jetapps/20210712.163528_9148.log

Installing jetbackup-cpanel version 5.1.12-10…Failed
Please see the log file /usr/local/jetapps/var/log/jetapps/20210712.163528_9148.log for more details

Looking at the referenced log file in the above snippet, you will see the actual cause of the failure: 

package jetbackup-base is not installed
Can’t connect to mongodb.
error: %pre(jetbackup5-base-5.1.12-11.x86_64) scriptlet failed, exit status 1
Error in PREIN scriptlet in rpm package jetbackup5-base-5.1.12-11.x86_64
error: jetbackup5-base-5.1.12-11.x86_64: install failed
package jetbackup-cpanel is not installed
Installing : jetbackup5-cpanel-5.1.12-10.x86_64 2/2
jetbackup5 registered
Plugin installed ok

Installed:
jetbackup5-cpanel.x86_64 0:5.1.12-10
Failed:
jetbackup5-base.x86_64 0:5.1.12-11

Description 

As part of the installation scripts for the jetbackup-base package, the connection to MongoDB on port 27217 needs to be confirmed before installation completes. The error occurs because the script is unable to do so.

Workaround

Ensure that the jetmongod service is running and that port 27217 is not filtered or blocked. The following command can be run to verify that the connection to MongoDB on port 27217 is working.

/usr/local/jetapps/usr/bin/mongod --quiet --port 27217