could not be resolved (2: Server failure) while in resolving client address,

[Ipoon]

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• [ *] Check if no issue or pull-request for this already exists.

Environment & Versions

Environment

• [* ] docker-compose

Versions

version 1.9

Description

how why

Logs

mailu/nginx:1.9 logs

2022/05/11 12:23:06 [error] 9#9: *1708 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: , request: "GET /auth/email HTTP/1.0", upstream: "http://192.168.203.10:80/internal/auth/email", host: "127.0.0.1"
2022/05/11 12:23:06 [error] 10#10: *1675 auth http server 127.0.0.1:8000 did not send server or port while in http auth state, client: 5.34.207.58, server: 0.0.0.0:25, login: "adminpass"
2022/05/11 12:23:06 [error] 10#10: *1711 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: , request: "GET /auth/email HTTP/1.0", upstream: "http://192.168.203.10:80/internal/auth/email", host: "127.0.0.1"
2022/05/11 12:23:06 [error] 10#10: *1634 auth http server 127.0.0.1:8000 did not send server or port while in http auth state, client: 5.34.207.58, server: 0.0.0.0:25, login: "kurs"
2022/05/11 12:23:06 [info] 10#10: *1713 client 5.34.207.58:34632 connected to 0.0.0.0:25
2022/05/11 12:23:06 [error] 10#10: *1713 5.34.207.58 could not be resolved (2: Server failure) while in resolving client address, client: 5.34.207.58, server: 0.0.0.0:25
2022/05/11 12:23:08 [error] 10#10: *1715 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: , request: "GET /auth/email HTTP/1.0", upstream: "http://192.168.203.10:80/internal/auth/email", host: "127.0.0.1"
2022/05/11 12:23:08 [error] 10#10: *1679 auth http server 127.0.0.1:8000 did not send server or port while in http auth state, client: 5.34.207.58, server: 0.0.0.0:25, login: "like"
2022/05/11 12:23:09 [info] 10#10: *1717 client 5.34.207.58:23262 connected to 0.0.0.0:25
2022/05/11 12:23:09 [error] 10#10: *1717 5.34.207.58 could not be resolved (2: Server failure) while in resolving client address, client: 5.34.207.58, server: 0.0.0.0:25
2022/05/11 12:23:11 [error] 10#10: *1720 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: , request: "GET /auth/email HTTP/1.0", upstream: "http://192.168.203.10:80/internal/auth/email", host: "127.0.0.1"
2022/05/11 12:23:11 [error] 10#10: *1713 auth http server 127.0.0.1:8000 did not send server or port while in http auth state, client: 5.34.207.58, server: 0.0.0.0:25, login: "vip112"
2022/05/11 12:23:12 [info] 10#10: *1722 client 5.34.207.58:11898 connected to 0.0.0.0:25
2022/05/11 12:23:12 [error] 10#10: *1722 5.34.207.58 could not be resolved (2: Server failure) while in resolving client address, client: 5.34.207.58, server: 0.0.0.0:25
2022/05/11 12:23:14 [error] 10#10: *1724 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: , request: "GET /auth/email HTTP/1.0", upstream: "http://192.168.203.10:80/internal/auth/email", host: "127.0.0.1"
2022/05/11 12:23:14 [error] 10#10: *1717 auth http server 127.0.0.1:8000 did not send server or port while in http auth state, client: 5.34.207.58, server: 0.0.0.0:25, login: "nocrimedays"
2022/05/11 12:23:15 [info] 10#10: *1726 client 5.34.207.58:64996 connected to 0.0.0.0:25
2022/05/11 12:23:15 [error] 10#10: *1726 5.34.207.58 could not be resolved (2: Server failure) while in resolving client address, client: 5.34.207.58, server: 0.0.0.0:25
2022/05/11 12:23:17 [error] 10#10: *1728 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: , request: "GET /auth/email HTTP/1.0", upstream: "http://192.168.203.10:80/internal/auth/email", host: "127.0.0.1"
2022/05/11 12:23:17 [error] 10#10: *1722 auth http server 127.0.0.1:8000 did not send server or port while in http auth state, client: 5.34.207.58, server: 0.0.0.0:25, login: "frank1"
2022/05/11 12:23:18 [info] 10#10: *1730 client 5.34.207.58:53618 connected to 0.0.0.0:25
2022/05/11 12:23:18 [error] 10#10: *1730 5.34.207.58 could not be resolved (2: Server failure) while in resolving client address, client: 5.34.207.58, server: 0.0.0.0:25
2022/05/11 12:23:20 [error] 10#10: *1732 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: , request: "GET /auth/email HTTP/1.0", upstream: "http://192.168.203.10:80/internal/auth/email", host: "127.0.0.1"
2022/05/11 12:23:20 [error] 10#10: *1726 auth http server 127.0.0.1:8000 did not send server or port while in http auth state, client: 5.34.207.58, server: 0.0.0.0:25, login: "natasha"
2022/05/11 12:23:21 [info] 10#10: *1734 client 5.34.207.58:42250 connected to 0.0.0.0:25
2022/05/11 12:23:21 [error] 10#10: *1734 5.34.207.58 could not be resolved (2: Server failure) while in resolving client address, client: 5.34.207.58, server: 0.0.0.0:25
2022/05/11 12:23:23 [error] 10#10: *1736 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: , request: "GET /auth/email HTTP/1.0", upstream: "http://192.168.203.10:80/internal/auth/email", host: "127.0.0.1"
2022/05/11 12:23:23 [error] 10#10: *1730 auth http server 127.0.0.1:8000 did not send server or port while in http auth state, client: 5.34.207.58, server: 0.0.0.0:25, login: "agana"
2022/05/11 12:23:24 [info] 10#10: *1738 client 5.34.207.58:30866 connected to 0.0.0.0:25
2022/05/11 12:23:24 [error] 10#10: *1738 5.34.207.58 could not be resolved (2: Server failure) while in resolving client address, client: 5.34.207.58, server: 0.0.0.0:25
2022/05/11 12:23:26 [error] 10#10: *1740 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: , request: "GET /auth/email HTTP/1.0", upstream: "http://192.168.203.10:80/internal/auth/email", host: "127.0.0.1"
2022/05/11 12:23:26 [error] 10#10: *1734 auth http server 127.0.0.1:8000 did not send server or port while in http auth state, client: 5.34.207.58, server: 0.0.0.0:25, login: "vodafone"
2022/05/11 12:23:27 [info] 10#10: *1742 client 5.34.207.58:19482 connected to 0.0.0.0:25
2022/05/11 12:23:27 [error] 10#10: *1742 5.34.207.58 could not be resolved (2: Server failure) while in resolving client address, client: 5.34.207.58, server: 0.0.0.0:25