Elasticsearch-php auth error

Hi,
I've been using the php client successfully with a remote server, and I've
set up a new server and run into auth problems using the PHP client
library.

$clientParams['connectionParams']['auth'] = array(
'user',
'pw',
'Basic'
);

My issue is now I get back a 401 Authentication Required every time I try
to hit the endpoints using the PHP client but I've gone on the chrome
extension Postman to try sending some basic auth requests using the user/pw
and the server responds correctly. Any ideas what might cause this or how
to go about debugging?

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