PUNCHH Firewall rules. Confirm that the following FQDN (Fully Qualified Domain Names) endpoints are properly whitelisted in the site's firewall/router
(PUNCHH DOES NOT SUPPORT FIREWALL RULES USING IP ADDRESSES):
NETWORK FIREWALL CONFIGURATION
NETWORK FIREWALL VALIDATION
From the each of the POS tablets, open a web browser navigate to the following web pages:
Each web page should return a plain white page with OK. If any page doesn't return OK, the firewall needs to be reviewed to ensure the correct FW rules are in place.