NSS: client certificate not found (nickname not specified)

Question

Working with the Paypal API, yes i've checked my config files, yes i've checked username and password.... i'm outa ideas. I'm using the ExpressCheckout API downloaded from and everytime i try call the setExpressCheckout method i get the following error:

NSS: client certificate not found (nickname not specified)

I know it's something to do with an SSL error, how do i go about solving the problem?

Answer 1

On August 3 and August 5 PayPal renewed the SSL certificates for the following API endpoints:

• api.paypal.com
• api-3t.paypal.com
• api-aa.paypal.com
• api-aa-3t.paypal.com

If you need to import the new PayPal SSL certificates into your application or system keystore/truststore you can download them from https://ppmts.custhelp.com/app/answers/detail/a_id/920/. If you don't typically import the PayPal SSL certificates into your keystore/truststore, no action is required on your part.

For Sandbox please use this link: https://ppmts.custhelp.com/app/answers/detail/a_id/924 to Download the new SSL Certificate.