My nextcloud snap (latest - 19.0.0) is running on Ubuntu (20.04 LTS). Everything was working fine and without any changes, I could not reach the nextcloud anymore on my server.
Here is the output of nextcloud logs:
sudo snap logs nextcloud
2020-07-03T08:57:28Z nextcloud.apache[4617]: System config value redis => port set to integer 0
2020-07-03T08:57:29Z nextcloud.apache[4681]: System config value memcache.locking set to string \OC\Memcache\Redis
2020-07-03T08:57:29Z nextcloud.apache[4740]: System config value memcache.local set to string \OC\Memcache\Redis
2020-07-03T08:57:29Z nextcloud.apache[4799]: No such app enabled: updatenotification
2020-07-03T08:57:30Z nextcloud.apache[4465]: Making sure nextcloud is fully upgraded...
2020-07-03T08:57:30Z nextcloud.apache[4918]: Nextcloud is already latest version
2020-07-03T08:57:30Z nextcloud.apache[4375]: All set! Running httpd...
2020-07-03T08:57:30Z nextcloud.apache[4932]: Certificates have been activated: using HTTPS only
2020-07-03T08:57:30Z nextcloud.apache[4932]: Certificates look to be in order: enabling HSTS
2020-07-03T08:57:30Z nextcloud.apache[4972]: AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
Also
sudo tail -n 30 /var/snap/nextcloud/current/apache/logs/error_log
Gives the ourput below:
[Fri Jul 03 12:07:45.277419 2020] [unixd:alert] [pid 6552:tid 140023688466432] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Jul 03 12:07:45.278655 2020] [unixd:alert] [pid 6554:tid 140023688466432] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Jul 03 12:07:45.278832 2020] [unixd:alert] [pid 6553:tid 140023688466432] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Jul 03 14:04:36.508368 2020] [mpm_event:notice] [pid 6551:tid 140023688466432] AH00491: caught SIGTERM, shutting down
[Fri Jul 03 14:04:39.238983 2020] [ssl:warn] [pid 15986:tid 139698003808256] AH01909: 127.0.1.1:444:0 server certificate does NOT include an ID which matches the server name
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
[Fri Jul 03 14:04:39.245715 2020] [ssl:warn] [pid 15986:tid 139698003808256] AH01909: 127.0.1.1:444:0 server certificate does NOT include an ID which matches the server name
[Fri Jul 03 14:04:39.247296 2020] [mpm_event:notice] [pid 15986:tid 139698003808256] AH00489: Apache/2.4.43 (Unix) OpenSSL/1.1.1 configured -- resuming normal operations
[Fri Jul 03 14:04:39.247333 2020] [core:notice] [pid 15986:tid 139698003808256] AH00094: Command line: 'httpd -d /snap/nextcloud/21796 -D EnableHTTPS -D EnableHSTS -D FOREGROUND'
[Fri Jul 03 14:04:39.248069 2020] [unixd:alert] [pid 15987:tid 139698003808256] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Jul 03 14:04:39.248338 2020] [unixd:alert] [pid 15989:tid 139698003808256] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Jul 03 14:04:39.248402 2020] [unixd:alert] [pid 15988:tid 139698003808256] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Jul 03 14:05:31.932136 2020] [mpm_event:notice] [pid 15986:tid 139698003808256] AH00491: caught SIGTERM, shutting down
[Fri Jul 03 14:08:11.011445 2020] [ssl:warn] [pid 2853:tid 139930176258048] AH01909: 127.0.1.1:444:0 server certificate does NOT include an ID which matches the server name
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
[Fri Jul 03 14:08:11.080225 2020] [ssl:warn] [pid 2853:tid 139930176258048] AH01909: 127.0.1.1:444:0 server certificate does NOT include an ID which matches the server name
[Fri Jul 03 14:08:11.081786 2020] [mpm_event:notice] [pid 2853:tid 139930176258048] AH00489: Apache/2.4.43 (Unix) OpenSSL/1.1.1 configured -- resuming normal operations
[Fri Jul 03 14:08:11.081824 2020] [core:notice] [pid 2853:tid 139930176258048] AH00094: Command line: 'httpd -d /snap/nextcloud/21796 -D EnableHTTPS -D EnableHSTS -D FOREGROUND'
[Fri Jul 03 14:08:11.169986 2020] [unixd:alert] [pid 2868:tid 139930176258048] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Jul 03 14:08:11.170025 2020] [unixd:alert] [pid 2867:tid 139930176258048] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Jul 03 14:08:11.170032 2020] [unixd:alert] [pid 2869:tid 139930176258048] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Jul 03 14:10:39.909697 2020] [mpm_event:notice] [pid 2853:tid 139930176258048] AH00491: caught SIGTERM, shutting down
[Fri Jul 03 14:10:43.122265 2020] [ssl:warn] [pid 4670:tid 140425090695168] AH01909: 127.0.1.1:444:0 server certificate does NOT include an ID which matches the server name
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
[Fri Jul 03 14:10:43.126522 2020] [ssl:warn] [pid 4670:tid 140425090695168] AH01909: 127.0.1.1:444:0 server certificate does NOT include an ID which matches the server name
[Fri Jul 03 14:10:43.127598 2020] [mpm_event:notice] [pid 4670:tid 140425090695168] AH00489: Apache/2.4.43 (Unix) OpenSSL/1.1.1 configured -- resuming normal operations
[Fri Jul 03 14:10:43.127624 2020] [core:notice] [pid 4670:tid 140425090695168] AH00094: Command line: 'httpd -d /snap/nextcloud/21796 -D EnableHTTPS -D EnableHSTS -D FOREGROUND'
[Fri Jul 03 14:10:43.128590 2020] [unixd:alert] [pid 4674:tid 140425090695168] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Jul 03 14:10:43.128659 2020] [unixd:alert] [pid 4673:tid 140425090695168] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Jul 03 14:10:43.129008 2020] [unixd:alert] [pid 4672:tid 140425090695168] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
Any idea what could be the reason?