Linux client error

Hi, I have UrBackup installed and working on my network. It is working with one Linux Mint box and one Windows box.

However, I have on Linux Mint 20 box that refuses to work. I installed the client and systemctl reports:

urbackupclientbackend.service - UrBackup Client backend
Loaded: loaded (/lib/systemd/system/urbackupclientbackend.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2021-04-01 16:20:12 EDT; 23h ago
Main PID: 4023314 (urbackupclientb)
Tasks: 11 (limit: 154035)
Memory: 3.3M
CGroup: /system.slice/urbackupclientbackend.service
└─4023314 /usr/local/sbin/urbackupclientbackend --config /etc/default/urbackupclient --no-consoletime

the client is listening:
ss -tulpn | grep 10050
tcp LISTEN 0 128 192.168.1.5:10050 0.0.0.0:*

However, /var/log/urbackupclient.log reports:

2021-04-01 12:01:35: WARNING: Shutting down (Signal 15)
2021-04-01 15:56:56: WARNING: Shutting down (Signal 15)
2021-04-01 16:02:42: WARNING: Shutting down (Signal 15)
2021-04-01 16:14:04: WARNING: Shutting down (Signal 15)
2021-04-01 16:15:23: WARNING: Shutting down (Signal 15)
2021-04-01 16:15:56: WARNING: Shutting down (Signal 15)
2021-04-01 16:18:38: WARNING: Shutting down (Signal 15)

It has never been able to start a backup.

Any suggestions on what I can take a look at?

Thank you.