From the fix common problems plugin:
 

/var/log is getting full (currently 80 % used)

Either your server has an extremely long uptime, or your syslog could be potentially being spammed with error messages. A reboot of your server will at least temporarily solve this problem, but ideally you should seek assistance in the forums and post your

Server has only been up for 32 days and just started getting this warning over the weekend. I attached the diagnostics zip file.

 

Any assistance in understanding what the problem is would be greatly appreciated.

hardi-unraid-diagnostics-20190904-0814.zip

Take your server out of the router's DMZ or don't forward the SSH ports to it

 

Aug 31 04:41:19 Hardi-unRAID nginx: 2019/08/31 04:41:19 [error] 4886#4886: *5009935 user "lbsb" was not found in "/etc/nginx/htpasswd", client: 213.136.90.36, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:20 Hardi-unRAID nginx: 2019/08/31 04:41:20 [error] 4886#4886: *5009938 user "aeon3" was not found in "/etc/nginx/htpasswd", client: 213.136.90.36, server: , request: "GET /Main HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:20 Hardi-unRAID nginx: 2019/08/31 04:41:20 [error] 4886#4886: *5009932 user "admin" was not found in "/etc/nginx/htpasswd", client: 5.189.166.164, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:20 Hardi-unRAID nginx: 2019/08/31 04:41:20 [error] 4886#4886: *5009935 user "lbsb" was not found in "/etc/nginx/htpasswd", client: 213.136.90.36, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:21 Hardi-unRAID nginx: 2019/08/31 04:41:21 [error] 4886#4886: *5009941 user "adm" was not found in "/etc/nginx/htpasswd", client: 5.189.166.164, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:21 Hardi-unRAID nginx: 2019/08/31 04:41:21 [error] 4886#4886: *5009943 user "admin" was not found in "/etc/nginx/htpasswd", client: 213.136.90.36, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:22 Hardi-unRAID nginx: 2019/08/31 04:41:22 [error] 4886#4886: *5009941 user "adm" was not found in "/etc/nginx/htpasswd", client: 5.189.166.164, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:22 Hardi-unRAID nginx: 2019/08/31 04:41:22 [error] 4886#4886: *5009938 user "aeon3" was not found in "/etc/nginx/htpasswd", client: 213.136.90.36, server: , request: "GET /Main HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:24 Hardi-unRAID nginx: 2019/08/31 04:41:24 [error] 4886#4886: *5009943 user "admin" was not found in "/etc/nginx/htpasswd", client: 213.136.90.36, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:25 Hardi-unRAID nginx: 2019/08/31 04:41:25 [error] 4886#4886: *5009951 user "admin" was not found in "/etc/nginx/htpasswd", client: 213.136.90.36, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:26 Hardi-unRAID nginx: 2019/08/31 04:41:26 [error] 4886#4886: *5009951 user "admin" was not found in "/etc/nginx/htpasswd", client: 213.136.90.36, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:27 Hardi-unRAID nginx: 2019/08/31 04:41:27 [error] 4886#4886: *5009956 user "admin" was not found in "/etc/nginx/htpasswd", client: 213.136.90.36, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:28 Hardi-unRAID nginx: 2019/08/31 04:41:28 [error] 4886#4886: *5009956 user "admin" was not found in "/etc/nginx/htpasswd", client: 213.136.90.36, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"
Aug 31 04:41:28 Hardi-unRAID nginx: 2019/08/31 04:41:28 [error] 4886#4886: *5009963 user "adm" was not found in "/etc/nginx/htpasswd", client: 5.189.166.164, server: , request: "GET /level/15/exec/-/show/configuration/CR HTTP/1.1", host: "76.167.231.67", referrer: "http://76.167.231.67/"

and on and on and on from various IPs around the world

Edited September 4, 20196 yr by Squid

Oof, I remember setting up port forwarding on my router for my unraid server back when I was trying to set up a NextCloud docker. Ended up ditching it but forgot to remove that. Thanks!