Seeing this error? Wrong API credentials, an expired token, or unwhitelisted IP cause auth failures. Below are the common causes and the fixes that resolve it for most users.

Why this happens

  • The API username, password or client credentials are wrong.
  • The auth token expired and was not refreshed.
  • Your server IP is not whitelisted with the GSP.
  • The wrong sandbox/production endpoint was used.

How to fix it

1

Refresh the token

Re-authenticate to get a fresh token; tokens are short-lived.

2

Whitelist your IP

Register your production IP with your GSP/ASP.

3

Verify credentials

Confirm API username/password and client keys with your GSP.

4

Check the endpoint

Ensure you are calling the production URL, not the sandbox.

Important
If the problem is on the portal side (maintenance or server load), no browser fix will help — confirm with a second network first.

Still stuck? Compare with other issues in the full error guide, or review the login guide.

Frequently asked questions

Why am I seeing the E-Way Bill API Authentication Error issue?
Wrong API credentials, an expired token, or unwhitelisted IP cause auth failures.
What's the quickest fix for e-way bill api authentication error?
Refresh the token: Re-authenticate to get a fresh token; tokens are short-lived.