# Troubleshooting overview

Source: https://developer.avalara.com/products/ecm/integration-guides/document-management/htu7375612574214/

Guide: Exemption Certificate Management (ECM)

# Troubleshooting overview

Resolve common authentication problems quickly and effectively.

This section describes how to solve common problems associated with authentication.

Refer to the following troubleshooting topics for detailed solutions:

-   [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.")
-   [Other common problems overview](/document-management/yhi7523302416054/ "Learn how to address common authentication problems.")