Fixed in this PR: #294

Error when trying to connect (Host violates local access rules)✖

I'm experiencing the same issue:
Error when trying to connect (Host violates local access rules)

https://github.com/nextcloud/server/blob/dba76c04bba910c3c6f1dec4f3eba6416ec3378d/lib/private/Http/Client/Client.php#L154-158
This was added in 19 update.

Solved adding this to config.php:

'allow_local_remote_servers' => true,

New release compatible with NC 19. https://github.com/ONLYOFFICE/onlyoffice-nextcloud/releases/tag/v4.2.0 Close this issue?

https://github.com/nextcloud/server/blob/dba76c04bba910c3c6f1dec4f3eba6416ec3378d/lib/private/Http/Client/Client.php#L154-158
This was added in 19 update.

Solved adding this to config.php:

'allow_local_remote_servers' => true,

Thanks for comment. (y)

Or using OCC: config:system:set allow_local_remote_servers --value true --type bool

Thanks for the comment with
'allow_local_remote_servers' => true,

i added this to
/var/www/html/nextcloud/config/config.php
on the nextcolud server

@ShockwaveNN i made it until here and this is the solution for the issue
ONLYOFFICE/DocumentServer#1659

i wonder if the documentation shall be adjusted on the Nextcloud AND on the ONLYOFFICE side
that is just my recommendation because I am not aware about how you guys integrate the two apps together
i would say because my construction is

• LOCAL nextcloud server subdomain1.domain1.tld1
• LOCAL onlyoffice server subdomain2.domain2.tld2
• LOCAL webserver reverse proxy who servers both domain1 and doain2 inside the same webserver :)

please treat me like a unexperienced webservices integrator :)