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standby's avatar
standby
Icon for Nimbostratus rankNimbostratus
Nov 13, 2022
Solved

Help with upstream prematurely closed!

Hello everyone! I'm trying to publish a blazor server app (just a template app for testing) on Nginx in debian 11. Actually i have like a week stucked with this problem, reading every post writted a...
devops
  • standby's avatar
    standby
    Nov 15, 2022

    I just solved the problem, the server block was redirecting to ssl, but when i call the upstream i was not doing with https!

    To solve i just change 

            proxy_pass http://dotnet;

     to 

            proxy_pass https://dotnet;

    and now everything works fine. 

    I hope this could help more ppl because i lost so much time in this...

Daniel_Wolf's avatar
Daniel_Wolf
Icon for MVP rankMVP
Nov 14, 2022

Hi standby,

your NIGNX config appears to be valid syntax. What error message to you get?
Do the ssl_certificate and ssl_certificate_key exist in the location you specified?

 

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;

    ssl_certificate /etc/nginx/cert.pem;
    ssl_certificate_key /etc/nginx/cert.key;

What outpout do you get when you run?

nginx -t

Did you try to run tcpdump on the server to check who is closing the connection? NGINX? Or your upstream server?

KR
Daniel