# How do I identify a firewall or proxy server?

Source: https://developer.avalara.com/products/ecm/integration-guides/document-management/rok9460823959846/

Guide: Exemption Certificate Management (ECM)

# How do I identify a firewall or proxy server?

Learn how to identify if a firewall or proxy server is affecting your connection.

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