# How do I identify a firewall or proxy server?

Source: https://developer.avalara.com/avatax-for-vat/jib6602610417976/

# How do I identify a firewall or proxy server?

Learn how to determine if a firewall or proxy server is in use.

To identify if a firewall or proxy server is in use, refer to the section [Identify a firewall or proxy server problem](/avatax-for-vat/fys7292932125587/ "Learn how to identify and resolve connection issues caused by firewalls or proxy servers blocking AvaTax URLs.") for detailed information.