Running rsync-3.2.3-20.el9_5.1.x86_64

Using the daemon with default provided configuration (/etc/sysconfig/rsyncd)

Configuration (partial)

lock file          = /var/run/rsyncd-mirrors.lock
read only          = true
max connections    = 16
log file           = /var/log/rsyncd/rpms.log
transfer logging   = yes
timeout            = 900
ignore nonreadable = yes
dont compress      = *.gz *.tgz *.zip *.z *.Z *.rpm *.deb *.bz2
refuse options     = checksum
uid                = apache
gid                = apache...
hosts allow =   ... very long list ...

[srpms]
        comment    = Remi's Source RPM (about 10GB)
        path       = /home/rpms/site/SRPMS...

Log sample

2025/01/29 04:00:01 [267227] name lookup failed for 2a0c:8541:200:2010::99: Name or service not known
2025/01/29 04:00:01 [267227] connect from UNKNOWN (2a0c:8541:200:2010::99)
2025/01/29 04:00:01 [267224] connect from mirror.serverion.com (185.28.39.100)
2025/01/29 04:00:01 [267227] rsync allowed access on module enterprise from UNKNOWN (2a0c:8541:200:2010::99)
2025/01/29 03:00:01 [267227] rsync on enterprise//date from UNKNOWN (2a0c:8541:200:2010::99)
2025/01/29 03:00:02 [267227] building file list
2025/01/29 03:00:02 [267227] sent 62 bytes  received 29 bytes  total size 29

I found https://access.redhat.com/solutions/313693

According to https://bugzilla.redhat.com/show_bug.cgi?id=201019 this is a very old issue, which was fixed in RHEL-5

IIRC, RHEL-8 (rsync 3.1) was not affected,
so seems to be a regression in RHEL-9 (rsync 3.2)