thanks @Tom-Elliott for your answer.
I’m confused i think i did not explained my problem clearly.
Debian 12 is my fog server 192.168.1.200
It serves ubuntu iso’s files via nfs , kernels initramfs via tftp and preseed via http(s).
Ubuntu are workstations i need to deploy Ubuntu iso files are on nfs si i don’t really understand.
Should i copy the fog ca in the iso’s nfs directory ?
Looks weird because i never needed this.
My browser works flawlessly with the certificate.
The only problem is when the boot option tries to get the preseed file via https.
the folder /opt/fog/snapins/ssl contains :
drwxrwxrwx 3 fogproject www-data 4,0K 4 juin 2020 .
drwxrwxrwx 3 fogproject www-data 4,0K 4 juin 2020 ..
drwxrwxrwx 2 fogproject www-data 4,0K 4 juin 2020 CA
-rwxrwxrwx 1 fogproject www-data 98 22 avril 14:13 ca.cnf
-rwxrwxrwx 1 fogproject www-data 1,7K 4 juin 2020 fog.csr
-rwxrwxrwx 1 fogproject www-data 232 4 juin 2020 req.cnf
-rwxrwxrwx 1 fogproject www-data 3,2K 4 juin 2020 .srvprivate.key
If i need to regenerate cert i don’t want to mess somewhere.