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authentication failed

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authentication failed

Our website has been taking payments with paypal payflow for several years. On Tuesday our server was upgraded.  Now we get the error despite having not made any coding changes:

1 User authentication failed 

We have registered the new ip address as an allowed IP address with paypal.  Our credentials are unchanged.

we have run a test program with pilot-payflowpro-paypal.com for payment. When tested locally we pass authentication but when we go live we get the error.

We have checked that the server is TLSv1.2 enabled, and .NET framework 4.6 is installed

.NET Frame version we set

        <compilation defaultLanguage="c#" debug="false" targetFramework="4.5.2" /> in web.config

 In  payment page

     System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

Any ideas as to why we are getting the error?