# DNS time-to-live

Source: https://developer.avalara.com/products/ecm/integration-guides/document-management/zzq9597053810761/

Guide: Exemption Certificate Management (ECM)

# DNS time-to-live

## What you might see or experience

-   Your application occasionally loses connection to Avalara services.
-   DNS lookups return outdated IP addresses.
-   AvaTax or related APIs stop working after Avalara updates DNS records.

## Why this happened

Some software doesn’t correctly handle DNS time-to-live (TTL) values. This causes it to cacheold IP addresses instead of refreshing them when Avalara updates its DNSrecords.

## What might help

Steps

Try the following:

-   Ensure your software respects DNS TTL values and periodically refreshesits DNS lookups.
-   Verify that your software or environment contacts DNS regularlyto update name resolutions.
-   Update your software if needed. Some versions, especially certain JavaJRE releases, may not handle TTL values correctly.
-   If problems continue after DNS updates, check the documentation for youroperating system, programming language, or developmentenvironment to confirm it handles TTL values properly.