Ispconfig 3.2 mysql refuse IP address with remote access

ISPC is 5 days old.
I try a PM but I didn't succeed in putting image in... ! only through url !?

 

I don't think the problem is coming from the ISPConfig GUI but it may come from your multi server setup.

 

It could be related to:
https://git.ispconfig.org/ispconfig/ispconfig3/-/issues/5910#note_85657

 

it describes exactly what's happening for me.
but, I don't understand what below coment from Till means
"Check the client limits of the client that owns this website, probably you missed settings a default database server there."
In my case, there is no client, I do it as c0/default.
when entering in mysql on ns2, 'show databases;' gives
| Database |
+--------------------+
| c0nextcloud_db |
| dbispconfig |
| information_schema |
| mysql |
| opendmarc |
| performance_schema |
| roundcube

I discover that I didn't run mysql_secure_installation on ns2
I did, but, I am worried to remove "remote root access". It is in the manual, so I follow...
I also create users ns1, ns2, IP1, IP2, grant privileges and flush as in manual pge 30-31. It seems to be for web interface but I try to see.
both changes had no good effect...

 

I try from both server : mysql -u root -h Ipoftheotherserver -p
Both accepts access after password entry...

 

I note that when I create a db
- from ns1, remote access is possible to activate for ns2.
- from ns2, remote access is impossible ...
ns1, is where is mysql "ispc main" database

 

I looked at it.
I though I could provide more details on it on that thread.