# Authentication Q-and-A

Source: https://developer.avalara.com/avatax-for-vat/qez6607544526393/

# Authentication Q-and-A

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?](/avatax-for-vat/oep2963342982907/ "Understand the separation of credentials between Sandbox and Production environments.")
-   [How do I verify that the service is up?](/avatax-for-vat/bht5159404587135/ "Learn how to check if the Avalara service is operational.")
-   [How do I add users?](/avatax-for-vat/cml5029698261962/ "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?](/avatax-for-vat/jib6602610417976/ "Learn how to determine if a firewall or proxy server is in use.")
-   [How do I reset my license key?](/avatax-for-vat/lam2968661472589/ "Learn how to reset your account license key using the AvaTax UI or the AccountResetLicenseKey API.")
-   [How do I reset my password?](/avatax-for-vat/aol7620899859095/ "Learn how to reset your Avalara Portal password if you've forgotten it.")
-   [I’m using .NET NugetAvaTaxpackage to connect to AvaTax. Are account ID and license code enough for AvaTaxAPI authentication?](/avatax-for-vat/qxx1463825564812/ "Learn whether account ID and license code are sufficient for AvaTax API authentication when using the .NET Nuget AvaTax package.")
-   [Is TLS required?](/avatax-for-vat/lvz6639283871745/ "Learn whether TLS is required for secure communication.")
-   [What authentication methods are supported?](/avatax-for-vat/xjj0021339444420/ "Learn about the authentication methods currently supported and planned for future updates.")
-   [What is the production URL?](/avatax-for-vat/xxm6589333090083/ "The production URL is used to access Avalara's REST API in a live environment.")
-   [What is the sandbox URL?](/avatax-for-vat/awi0078268825126/ "Find the URL for accessing the Avalara sandbox environment.")
-   [What ports are used for communication?](/avatax-for-vat/lpv2992764006283/ "AvaTax communicates using specific ports to ensure secure data transmission.")
-   [Where can I get the SDK?](/avatax-for-vat/cwp2839354840257/ "Find out where to access SDKs for supported programming languages.")
-   [Where do I input the client ID?](/avatax-for-vat/ngi0553728044952/ "Learn where to input the client ID for Avalara SDKs.")
-   [Whom do I contact if my sandbox is expired?](/avatax-for-vat/xpv3978696241987/ "Learn who to contact if your sandbox account has expired and explore options for a free, nonexpiring sandbox.")