upstream prematurely closed connection

Thierry nginx-forum at
Sun Jan 8 07:37:19 UTC 2017

I have done some midification:

On my email server, I have upgrading my Nginx from 1.6 to 1.9.
I have add: http2

Both Nginx (email server and reverse proxy) have now the same Nginx
But still have the same problem.

Thx for your support.

Posted at Nginx Forum:,271847,271858#msg-271858

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