I suddenly got a 520 error

Hi you guys,

I’m facing 520 Error issue.

There was no problem when WAF was introduced on 2019/9/13, but Error 520 has been displayed since September 26, 2019.

However, the return code 200 is returned from the origin server managed by the me as follows.

[01/10/2019 17:52:17 +0900] 200 0 "dev01.xxx.com/portal/hakone/index.html" "GET" "http://dev01.xxx.com / portal / hakone / "" Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML, like Gecko) Chrome / 77.0.3865.90 Safari / 537.36 "

I tried reverting the source until early September, but it didn’t work.
I confirmed that there is no IP restriction with iptables, hosts.deny, etc.
I have confirmed that it is displayed in a different directory without any problems.

OK: http://dev01.xxx.com/portal/atagawa/
NG: http://dev01.xxx.com/portal/e-izu/index.html
NG: http://dev01.xxx.com/portal/hakone/

I would be grateful if you could tell me what the possible causes are.

A 520 would be covered at Community Tip - Fixing Error 520: Web server is returning an unknown error but I guess you have been there already, havent you?

Without the actual URL it is impossible to say anything at all.

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