@Yoe777 To check if the IP address that ftp.ut-capitole.fr resolves to, 193.49.48.249, is listed anywhere:
grep "193.49.48.249" /var/db/pfblockerng/DNSBLIP_v4.txt /var/db/pfblockerng/deny/*.txt /var/db/pfblockerng/original/*.orig /var/unbound/pfb_py_ss.txt
If no output is returned, that means the IP is not potentially being filtered anywhere by pfBlockerNG. (The "No such file or directory" output should be ignored.)
I've also noticed just now that the domain heimdall.ut-capitole.fr is a CNAME of ftp.ut-capitole.fr. You should ensure that heimdall.ut-capitole.fr is also either not listed and/or whitelisted.