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Can't query Zuora

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Can't query Zuora

My production system stopped working.

 

I am making API SOAP calls.  C#.NET.

 

I seem to be connecting just fine.

 

It is failing when making the first call to query payments. I'm passing a query string like this: 
SELECT AccountId, AccountingCode, Amount ... 
FROM Payment 
WHERE PaymentNumber > '" + pmtNo + "'" 
AND Status = 'Processed'

I'm throwing an error on this: 
return zs.Query(sql);

Could not establish secure channel for SSL/TLS with authority 'www.zuora.com'

This started failing on Monday this week