How do I reveal real IPs using CloudFlare

If I visit the forum it just gives me a Error 521 Web server down.
This is what was in the current log file:

2021-08-11 12:14:46.898 UTC [556] LOG:  starting PostgreSQL 13.3 (Debian 13.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
2021-08-11 12:14:46.899 UTC [556] LOG:  listening on IPv4 address "0.0.0.0", port 5432
2021-08-11 12:14:46.899 UTC [556] LOG:  listening on IPv6 address "::", port 5432
2021-08-11 12:14:46.996 UTC [556] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2021-08-11 12:14:47.112 UTC [577] LOG:  database system was interrupted; last known up at 2021-08-10 14:46:03 UTC
2021-08-11 12:14:47.852 UTC [577] LOG:  database system was not properly shut down; automatic recovery in progress
2021-08-11 12:14:47.902 UTC [577] LOG:  redo starts at 0/3DFE308
2021-08-11 12:14:47.905 UTC [577] LOG:  invalid record length at 0/3E0A2D8: wanted 24, got 0
2021-08-11 12:14:47.905 UTC [577] LOG:  redo done at 0/3E0A2B0
2021-08-11 12:14:48.332 UTC [556] LOG:  database system is ready to accept connections
2021-08-11 15:09:07.632 UTC [556] LOG:  received smart shutdown request
2021-08-11 15:09:08.970 UTC [556] LOG:  background worker "logical replication launcher" (PID 585) exited with exit code 1
2021-08-11 15:09:08.973 UTC [580] LOG:  shutting down
2021-08-11 15:09:09.018 UTC [556] LOG:  database system is shut down
2021-08-11 15:14:54.109 UTC [564] LOG:  starting PostgreSQL 13.3 (Debian 13.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
2021-08-11 15:14:54.110 UTC [564] LOG:  listening on IPv4 address "0.0.0.0", port 5432
2021-08-11 15:14:54.110 UTC [564] LOG:  listening on IPv6 address "::", port 5432
2021-08-11 15:14:54.132 UTC [564] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2021-08-11 15:14:54.136 UTC [576] LOG:  database system was shut down at 2021-08-11 15:14:20 UTC
2021-08-11 15:14:54.147 UTC [564] LOG:  database system is ready to accept connections
2021-08-11 15:48:11.435 UTC [564] LOG:  received smart shutdown request
2021-08-11 15:48:12.349 UTC [564] LOG:  background worker "logical replication launcher" (PID 582) exited with exit code 1
2021-08-11 15:48:12.349 UTC [577] LOG:  shutting down
2021-08-11 15:48:12.397 UTC [564] LOG:  database system is shut down
2021-08-11 15:48:17.233 UTC [555] LOG:  starting PostgreSQL 13.3 (Debian 13.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
2021-08-11 15:48:17.233 UTC [555] LOG:  listening on IPv4 address "0.0.0.0", port 5432
2021-08-11 15:48:17.233 UTC [555] LOG:  listening on IPv6 address "::", port 5432
2021-08-11 15:48:17.245 UTC [555] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2021-08-11 15:48:17.255 UTC [570] LOG:  database system was shut down at 2021-08-11 15:48:12 UTC
2021-08-11 15:48:17.271 UTC [555] LOG:  database system is ready to accept connections
2021-08-11 18:24:06.544 UTC [555] LOG:  received smart shutdown request
2021-08-11 18:24:11.892 UTC [555] LOG:  background worker "logical replication launcher" (PID 576) exited with exit code 1
2021-08-11 18:24:11.895 UTC [571] LOG:  shutting down
2021-08-11 18:24:11.936 UTC [555] LOG:  database system is shut down
2021-08-11 18:59:31.940 UTC [554] LOG:  starting PostgreSQL 13.3 (Debian 13.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
2021-08-11 18:59:31.940 UTC [554] LOG:  listening on IPv4 address "0.0.0.0", port 5432
2021-08-11 18:59:31.940 UTC [554] LOG:  listening on IPv6 address "::", port 5432
2021-08-11 18:59:31.964 UTC [554] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2021-08-11 18:59:31.977 UTC [570] LOG:  database system was shut down at 2021-08-11 18:24:11 UTC
2021-08-11 18:59:32.004 UTC [554] LOG:  database system is ready to accept connections