Horde Webmail & Nginx = 502 Bad Gateway

[tom12]

Since approx. one week I get a 502 nginx error when trying to access webmail (Horde). The nginx error log shows me this:
[error] 12098#0: *93045 connect() failed (111: Connection refused) while connecting to upstream, client: xx.xx.xx.xx, server: roundcube.webmail, request: ""GET / HTTP/1.1", upstream: "http://x.xx.xx.xx:7080/", host: "webmail.xxxxxx.at"

I wonder why it says "server: roundcube.webmail"

Any help is appreciated.

 

[Jose_Antonio_Morales]

7080 is the port apache ends configured once you activate nginx, is apache active?

 

[tom12]

Yes, the Panel and my console tell me so. I restarted Apache, too. The error remains.
Thank you for your answer.