Alright, I know that alot of things break “suddenly” in IT, but I can swear I did not do anything this time. I have had reports of some users that were saying that they aren’t able to access SOGo. When I tried this myself, I got the following page:

The logs say the following when trying to restart, then access SOGo:
nginx-mailcow_1 | 172.22.1.8 - - [03/May/2022:17:17:50 -0100] "GET / HTTP/1.1" 200 15 "-" "check_http/v (nagios-plugins 2.3.3)" nginx-mailcow_1 | 10.60.1.113 - - [03/May/2022:17:17:52 -0100] "HEAD / HTTP/1.0" 200 0 "-" "KEMP 1.0" nginx-mailcow_1 | 10.61.0.14 - - [03/May/2022:17:17:53 -0100] "HEAD / HTTP/1.0" 200 0 "-" "KEMP 1.0" nginx-mailcow_1 | 127.0.0.1 - - [03/May/2022:17:17:54 -0100] "GET /sogo-auth HTTP/1.0" 200 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0" nginx-mailcow_1 | 10.61.0.110 - - [03/May/2022:17:17:54 -0100] "GET /SOGo/ HTTP/2.0" 502 2038 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0" nginx-mailcow_1 | 2022/05/03 17:17:54 [error] 20#20: *197 connect() failed (111: Connection refused) while connecting to upstream, client: 10.61.0.110, server: mail-21.intranet.vanduysen.be, request: "GET /SOGo/ HTTP/2.0", upstream: "http://172.22.1.248:20000/SOGo/", host: "10.61.0.11" nginx-mailcow_1 | 10.61.0.110 - - [03/May/2022:17:17:54 -0100] "GET /favicon.ico HTTP/2.0" 404 146 "https://10.61.0.11/SOGo/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0" nginx-mailcow_1 | 2022/05/03 17:17:55 [error] 20#20: *197 connect() failed (111: Connection refused) while connecting to upstream, client: 10.61.0.110, server: mail-21.intranet.vanduysen.be, request: "GET /SOGo/ HTTP/2.0", upstream: "http://172.22.1.248:20000/SOGo/", host: "10.61.0.11" nginx-mailcow_1 | 127.0.0.1 - - [03/May/2022:17:17:55 -0100] "GET /sogo-auth HTTP/1.0" 200 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0" nginx-mailcow_1 | 10.61.0.110 - - [03/May/2022:17:17:55 -0100] "GET /SOGo/ HTTP/2.0" 502 2038 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0" nginx-mailcow_1 | 10.61.0.110 - - [03/May/2022:17:17:56 -0100] "GET /favicon.ico HTTP/2.0" 404 146 "https://10.61.0.11/SOGo/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0" nginx-mailcow_1 | 127.0.0.1 - - [03/May/2022:17:17:56 -0100] "GET /sogo-auth HTTP/1.0" 200 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0" nginx-mailcow_1 | 10.61.0.110 - - [03/May/2022:17:17:56 -0100] "GET /SOGo/ HTTP/2.0" 502 2038 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0" nginx-mailcow_1 | 2022/05/03 17:17:56 [error] 20#20: *197 connect() failed (111: Connection refused) while connecting to upstream, client: 10.61.0.110, server: mail-21.intranet.vanduysen.be, request: "GET /SOGo/ HTTP/2.0", upstream: "http://172.22.1.248:20000/SOGo/", host: "10.61.0.11" php-fpm-mailcow_1 | 172.22.1.2 - 03/May/2022:17:17:43 -0100 "GET /json_api.php" 200 php-fpm-mailcow_1 | fd4d:6169:6c63:6f77::2 - 03/May/2022:17:17:44 -0100 "HEAD /index.php" 200 php-fpm-mailcow_1 | 172.22.1.2 - 03/May/2022:17:17:45 -0100 "GET /json_api.php" 200 php-fpm-mailcow_1 | fd4d:6169:6c63:6f77::2 - 03/May/2022:17:17:45 -0100 "GET /json_api.php" 200 php-fpm-mailcow_1 | 172.22.1.2 - 03/May/2022:17:17:45 -0100 "GET /json_api.php" 200 php-fpm-mailcow_1 | 172.22.1.2 - 03/May/2022:17:17:45 -0100 "GET /json_api.php" 200 php-fpm-mailcow_1 | 172.22.1.2 - 03/May/2022:17:17:45 -0100 "GET /json_api.php" 200 php-fpm-mailcow_1 | fd4d:6169:6c63:6f77::2 - 03/May/2022:17:17:45 -0100 "GET /json_api.php" 200 php-fpm-mailcow_1 | fd4d:6169:6c63:6f77::2 - 03/May/2022:17:17:45 -0100 "GET /json_api.php" 200 php-fpm-mailcow_1 | fd4d:6169:6c63:6f77::2 - 03/May/2022:17:17:52 -0100 "HEAD /index.php" 200 php-fpm-mailcow_1 | 172.22.1.2 - 03/May/2022:17:17:53 -0100 "HEAD /index.php" 200 php-fpm-mailcow_1 | 172.22.1.2 - 03/May/2022:17:17:54 -0100 "GET /sogo-auth.php" 200 php-fpm-mailcow_1 | fd4d:6169:6c63:6f77::2 - 03/May/2022:17:17:55 -0100 "GET /sogo-auth.php" 200 php-fpm-mailcow_1 | 172.22.1.2 - 03/May/2022:17:17:56 -0100 "GET /sogo-auth.php" 200

Does anyone have any idea what the issue could be? Thanks in advance!