Following instruction on this page you can test if your host has accses to the public internet.
On the host that runs your service run the next command:
echo quit | timeout 3 telnet 8.8.8.8 53
Above command will try for three seconds to connect to a commonly knonw name server hosted by google (port 53 is the default port for DNS services).
TIP: If google services are not available in your organization, please pick a suitable alternative IP address port pair. In the UK echo quit | timeout 3 telnet 1.1.1.1 53 is probably a good pick IF you are not limited to N3/HSNC. 1.1.1.1 is cloudflare managed domain server.
Expected success output
Trying 8.8.8.8... Connected to 8.8.8.8. Escape character is '^]'. Connection closed by foreign host.
This means that your machine can establish a network connection to a google server on port 53.
Expected failure output
Trying 8.8.8.8...
Absence of Connected to 8.8.8.8. indicates that your client cannot establish a network connection to a 8.8.8.8 server on port 53.
This is most probably an issue in your network.
NEXT: Try to resolve the issue within your organization.