kazumiさん
nanasessさん　

ご連絡ありがとうございます。

さくらサーバーのエラーログを添付します。
よろしくお願い申し上げます。

[Wed Apr 17 08:06:40.485828 2019] [cgi:error] [pid 25657] [client 118.10.99.45:0] End of script output before headers: index.php, referer: https://www.km-co.jp/ecs/virtual/sln_payment4/config
[Wed Apr 17 08:48:34.634891 2019] [cgi:error] [pid 33984] [client 118.10.99.45:0] End of script output before headers: index.php, referer: https://www.km-co.jp/ecs/virtual/sln_payment4/config
[Wed Apr 17 09:14:42.766271 2019] [cgi:error] [pid 49193] [client 118.10.99.45:0] End of script output before headers: index.php, referer: https://www.km-co.jp/ecs/virtual/store/plugin/api/upgrade/2/confirm
[Wed Apr 17 09:21:08.871052 2019] [cgi:error] [pid 50879] [client 118.10.99.45:0] End of script output before headers: index.php, referer: https://www.km-co.jp/ecs/virtual/store/plugin/api/upgrade/2/confirm
[Wed Apr 17 09:27:05.694711 2019] [cgi:error] [pid 50879] [client 118.10.99.45:0] End of script output before headers: index.php, referer: https://www.km-co.jp/ecs/virtual/store/plugin/api/upgrade/2/confirm
[Wed Apr 17 09:29:41.011604 2019] [cgi:error] [pid 50879] [client 118.10.99.45:0] malformed header from script 'index.php': Bad header: gen -> /tmp//proxy_OkEeLerjpqy, referer: https://www.km-co.jp/ecs/virtual/store/plugin/api/upgrade/2/confirm
[Wed Apr 17 10:26:38.450520 2019] [suexec:notice] [pid 80892] AH01232: suEXEC mechanism enabled (wrapper: /usr/local/apache/bin/suexec)
[Wed Apr 17 10:26:38.485765 2019] [ssl:warn] [pid 80892] AH01916: Init: (www.km-co.jp:443) You configured HTTP(80) on the standard HTTPS(443) port!
[Wed Apr 17 10:26:38.491030 2019] [ssl:warn] [pid 80892] AH01916: Init: (km-co.jp:443) You configured HTTP(80) on the standard HTTPS(443) port!
[Wed Apr 17 10:26:38.591829 2019] [ssl:warn] [pid 80955] AH01873: Init: Session Cache is not configured [hint: SSLSessionCache]
[Wed Apr 17 10:26:38.591850 2019] [ssl:warn] [pid 80955] AH01916: Init: (www.km-co.jp:443) You configured HTTP(80) on the standard HTTPS(443) port!
[Wed Apr 17 10:26:38.591853 2019] [ssl:warn] [pid 80955] AH01916: Init: (km-co.jp:443) You configured HTTP(80) on the standard HTTPS(443) port!
[Wed Apr 17 10:26:38.597044 2019] [mpm_prefork:notice] [pid 80955] AH00163: Apache/2.4.39 (Unix) OpenSSL/1.0.2o configured -- resuming normal operations
[Wed Apr 17 10:26:38.597104 2019] [core:notice] [pid 80955] AH00094: Command line: '/usr/local/apache/bin/httpd -f /home/config/users/virtual/http/user-httpd.conf'
[Wed Apr 17 15:16:48.206306 2019] [suexec:notice] [pid 18867] AH01232: suEXEC mechanism enabled (wrapper: /usr/local/apache/bin/suexec)
[Wed Apr 17 15:16:48.206776 2019] [ssl:warn] [pid 18867] AH01916: Init: (www.km-co.jp:443) You configured HTTP(80) on the standard HTTPS(443) port!
[Wed Apr 17 15:16:48.206781 2019] [ssl:warn] [pid 18867] AH01916: Init: (km-co.jp:443) You configured HTTP(80) on the standard HTTPS(443) port!
[Wed Apr 17 15:16:48.246704 2019] [ssl:warn] [pid 18927] AH01873: Init: Session Cache is not configured [hint: SSLSessionCache]
[Wed Apr 17 15:16:48.246725 2019] [ssl:warn] [pid 18927] AH01916: Init: (www.km-co.jp:443) You configured HTTP(80) on the standard HTTPS(443) port!
[Wed Apr 17 15:16:48.246728 2019] [ssl:warn] [pid 18927] AH01916: Init: (km-co.jp:443) You configured HTTP(80) on the standard HTTPS(443) port!
[Wed Apr 17 15:16:48.254308 2019] [mpm_prefork:notice] [pid 18927] AH00163: Apache/2.4.39 (Unix) OpenSSL/1.0.2o configured -- resuming normal operations
[Wed Apr 17 15:16:48.254345 2019] [core:notice] [pid 18927] AH00094: Command line: '/usr/local/apache/bin/httpd -f /home/config/users/virtual/http/user-httpd.conf'

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■ ECCUBEのバージョン：4系
■ サーバー名：さくらインターネット
■ データベース：MySQL/PHP7