# Authentication FAQs overview

Source: https://developer.avalara.com/products/ecm/integration-guides/document-management/dxa2750121157839/

Guide: Exemption Certificate Management (ECM)

# Authentication FAQs overview

Find answers to common authentication setup and transaction issues.

This section provides topics for AvaTax authentication. It includes information on credentials, environments, TLS, endpoints, SDK usage, and user management.

Topics covered include:

-   [Can I use my credentials in both Sandbox and Production environments?](/document-management/rgl4379392010765/ "Learn whether you can use the same credentials for both Sandbox and Production environments in AvaTax.")
-   [How can I check to confirm that the service is up?](/document-management/lxa9348942194192/ "Learn how to confirm if the Avalara service is operational.")
-   [How do I add users?](/document-management/qqo6391914004044/ "Learn how to add users to your account using the AvaTax UI or the CreateUsers API.")
-   [How do I identify a firewall or proxy server?](/document-management/rok9460823959846/ "Learn how to identify if a firewall or proxy server is affecting your connection.")
-   [How do I reset my license key?](/document-management/aar4361541902564/ "Learn how to reset your account license key using the AvaTax UI or API.")
-   [How do I reset my password?](/document-management/pyb1841466296682/ "Reset your AvaTax account password when you can't sign in.")
-   [I’m using the .NET Nuget AvaTax package to connect to AvaTax. Are account ID and license code enough for AvaTax API authentication?](/document-management/ibl0095800851263/ "Learn whether account ID and license code are sufficient for AvaTax API authentication when using the .NET Nuget AvaTax package.")
-   [Is TLS required?](/document-management/qch8087686064082/ "Learn whether TLS is required for secure communication.")
-   [What authentication methods are supported?](/document-management/srv9119517239074/ "Learn about the authentication methods currently supported by AvaTax.")
-   [What is the Production URL?](/document-management/nty9519414430791/ "Learn the URL used to access the production environment for Avalara services.")
-   [What is the Sandbox URL?](/document-management/hmh0381845766331/ "Find the URL for accessing the Avalara Sandbox environment.")
-   [What ports are used for communication?](/document-management/lwq3060910709147/ "Learn which ports are required for communication with ECM.")
-   [Where can I get the SDK?](/document-management/yeu0456602768195/ "Find out where to access SDKs for supported programming languages.")
-   [Where do I input the client ID?](/document-management/kff7026261442881/ "Learn where to input the client ID for Avalara SDKs.")
-   [Who do I contact if my Sandbox is expired?](/document-management/bdn9068937319395/ "Learn who to contact if your Sandbox account has expired and how to get a free, nonexpiring Sandbox account.")