Thank you VNick and Nik G.
I will try VNick's advice later.
Firewall settings.
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#iptables -nL
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8447
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8443
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8880
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:443
***************************
Here is detailed log.
***********autoinstaller3.log(Japanease)*****
[2021-10-15 22:43:16.345971] FileFetcher: get file (~empty)/pool/PSA_18.0.39_7267/plesk-18.0.39-cos7-x86_64.inf3
[2021-10-15 22:43:16.346089] ファイルをダウンロード中 pool/PSA_18.0.39_7267/plesk-18.0.39-cos7-x86_64.inf3: 0%
[2021-10-15 22:43:16.362071] ファイルをダウンロード中 pool/PSA_18.0.39_7267/plesk-18.0.39-cos7-x86_64.inf3: 100% 終了しました
[2021-10-15 22:43:16.367910] Warning: BuildLoader finish with unsuccess.
[2021-10-15 22:43:16.368187] Getting new version of Plesk Installer...
[2021-10-15 22:43:16.368289] SourceUrl: original source url is
Index of /Installer/3.39.0
[2021-10-15 22:43:16.368372] SourceUrl: fixed url is
Index of /Installer/3.39.0
[2021-10-15 22:43:16.368435] FileFetcher new object: target_dir=/var/cache/parallels_installer/, main_source_url=
Index of /Installer/3.39.0
[2021-10-15 22:43:16.368609] FileFetcher: get file (~empty)/parallels_installer_CentOS_7_x86_64.md5sum
[2021-10-15 22:43:16.368759] ファイルをダウンロード中 parallels_installer_CentOS_7_x86_64.md5sum: 0%
[2021-10-15 22:43:17.031383] ファイルをダウンロード中 parallels_installer_CentOS_7_x86_64.md5sum: 100% 終了しました
[2021-10-15 22:43:17.032155] FileFetcher: get file (~empty)/parallels_installer_CentOS_7_x86_64
[2021-10-15 22:43:17.032360] ファイルをダウンロード中 parallels_installer_CentOS_7_x86_64: 0%
[2021-10-15 22:43:21.719974] Warning: unlocalized key download_file
[2021-10-15 22:43:21.720301] Messages::setLocale: try to create object for locale: ja_JP.UTF-8
[2021-10-15 22:43:21.720611] Warning: unlocalized key download_file
[2021-10-15 22:43:21.726496] Messages::setLocale: try to create object for locale: ja_JP.UTF-8
[2021-10-15 22:52:57.503303] Environment locale name is 'C'
[2021-10-15 22:52:57.506130]
[2021-10-15 22:52:57.506255] SourceUrl: original source url is
Index of /
[2021-10-15 22:52:57.506351] SourceUrl: fixed url is
Index of /
[2021-10-15 22:52:57.507915] Try to find rcfile...
[2021-10-15 22:52:57.509239] Autoinstaller found rcfile at /root/.autoinstallerrc
[2021-10-15 22:52:57.509442] Option from rc file:: 'SSL_PROTOCOLS' = 'TLSv1.2'
[2021-10-15 22:52:57.509507] Option from rc file:: 'SSL_CIPHERS' = 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256'
[2021-10-15 22:52:57.509638] Option from rc file:: 'SSL_CIPHER_SERVER_PREFERENCE' = 'yes'
[2021-10-15 22:52:57.509764] Read component settings from /root/.autoinstaller/options.ini
[2021-10-15 22:52:57.510762] Got OS name Linux, vendor CentOS, version 7.9.2009, arch x86_64, environment ~empty
[2021-10-15 22:52:57.542338] Environment locale name is 'C'
[2021-10-15 22:52:57.544161]
[2021-10-15 22:52:57.544238] SourceUrl: original source url is
Index of /
[2021-10-15 22:52:57.544304] SourceUrl: fixed url is
Index of /
[2021-10-15 22:52:57.545368] Try to find rcfile...
[2021-10-15 22:52:57.545468] Autoinstaller found rcfile at /root/.autoinstallerrc
[2021-10-15 22:52:57.545669] Option from rc file:: 'SSL_PROTOCOLS' = 'TLSv1.2'
[2021-10-15 22:52:57.545719] Option from rc file:: 'SSL_CIPHERS' = 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256'
[2021-10-15 22:52:57.545756] Option from rc file:: 'SSL_CIPHER_SERVER_PREFERENCE' = 'yes'
[2021-10-15 22:52:57.545828] Read component settings from /root/.autoinstaller/options.ini
[2021-10-15 22:52:57.546319] Got OS name Linux, vendor CentOS, version 7.9.2009, arch x86_64, environment ~empty
[2021-10-15 22:52:57.547149] Execute command "/usr/local/psa/admin/bin/autoinstaller" "--service-mode" "--enable-xml-output" "--ssl-cert" "/usr/local/psa/admin/conf/httpsd.pem" "--branch" "release,stable" --web-interface --with-ssl --disable-browser
[2021-10-15 22:52:57.549116] Warning: Failed to attach to cgroup /sys/fs/cgroup/systemd/user/root/tasks, installer might be unexpectedly killed later by the system
[2021-10-15 22:52:57.573464] Environment locale name is 'C'
[2021-10-15 22:52:57.575312]
[2021-10-15 22:52:57.575380] SourceUrl: original source url is
Index of /
[2021-10-15 22:52:57.575444] SourceUrl: fixed url is
Index of /
[2021-10-15 22:52:57.576500] Try to find rcfile...
[2021-10-15 22:52:57.576639] Autoinstaller found rcfile at /root/.autoinstallerrc
[2021-10-15 22:52:57.576752] Option from rc file:: 'SSL_PROTOCOLS' = 'TLSv1.2'
[2021-10-15 22:52:57.576801] Option from rc file:: 'SSL_CIPHERS' = 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256'
[2021-10-15 22:52:57.576837] Option from rc file:: 'SSL_CIPHER_SERVER_PREFERENCE' = 'yes'
[2021-10-15 22:52:57.576910] Read component settings from /root/.autoinstaller/options.ini
[2021-10-15 22:52:57.577006] DEBUG: ignore option --service-mode because environment variable WEB_SECRET is already set.
[2021-10-15 22:52:57.577461] Got OS name Linux, vendor CentOS, version 7.9.2009, arch x86_64, environment ~empty
[2021-10-15 22:52:57.578319] Warning: Failed to attach to cgroup /sys/fs/cgroup/systemd/user/root/tasks, installer might be unexpectedly killed later by the system
[2021-10-15 22:52:57.579845] DEBUG: web server PID: 15445
[2021-10-15 22:52:59.589901] Error: Can't start build-in web-server
*************************************************