SOLVED FileManager edit wp-config.php

[olGerva]

Good day everyone
Since some days, on my VPS, it is not possible to edit the file wp-config.php. File Manager crashes as per the image.
We have editing the file permissions but nothing.
We also tried renaming the file by adding letters "aa" in front, but nothing.

However, when we put a letter "a" after config, then "wp-configa.php," the file became editable????

I searched the internet for a possible cause and solution but nothing.

NB:
- Any other file is editable normally.
- The machines are managed directly and no changes have been made lately.
- They have CSF Firewall installed but since they were born so I don't think it is attributable.
- The Wordpress configuration file has this problem right at the beginning and not because some plugin or other is installed.

The strange thing is that it has always been possible to edit the file.

Can I have a suggestion to this annoying problem?
Thank you

 

[olGerva]

Guys solved.
CloudFlare is the cause.
In short, in Cloud Flare we put a domain and created several subdomains as many as the VPSs we manage.
To these subdomains we activated Proxied just last week and this is the cause.

Please leave this note maybe useful to others
Thank you and sorry.
Good work

 

[cPRex]

I'm glad you were able to track that down to Cloudflare - thanks for sharing the solution!