one of the following
    IPTables
    nftables
    Firewalld
        /usr/bin/python3 /usr/sbin/firewalld --nofork --nopid
        https://www.tecmint.com/manage-firewalld-and-ufw-on-linux/
        firewall-cmd --state
    UFW

$ sudo dnf install selinux-policy

python3-firewall-2.1.4-2.fc40.noarch

?
https://cyberchaos.dev/e1mo/nixfiles/-/blob/2a395103cfde4d70c3670c5a51538cd9d0c254cb/modules/nftables/default.nix
https://code.mayfirst.org/mfmt/bruce/-/blob/master/bruce_banner.py
    nft --check
https://lists.osmocom.org/hyperkitty/list/gerrit-log@lists.osmocom.org/thread/VSV4C24PFCMFWV2BPRRIGNYICLDXPHZR/
    --- a/contrib/systemd/osmo-upf.service
    +++ b/contrib/systemd/osmo-upf.service
    @@ -12,6 +12,7 @@
     Group=osmocom
     ExecStart=/usr/bin/osmo-upf -c /etc/osmocom/osmo-upf.cfg
     RestartSec=2
    +AmbientCapabilities=CAP_NET_ADMIN
 
???
nft --debug all flush ruleset
???
Conflicts=iptables.service ip6tables.service ebtables.service ipset.service nftables.service

sudo vi /usr/lib/python3.12/site-packages/firewall/core/fw.py
line 583, in _start_apply_objects
class Firewall:
    ...
    def _start_apply_objects(self, reload = False, complete_reload = False):
        ...
        transaction = FirewallTransaction(self) 
        ...
        self.apply_default_tables(use_transaction = transaction)
        transaction.execute(True)   # !!!
    ...
    def apply_default_tables(self, use_transaction = None):
        ...
        transaction = use_transaction
        ...
        for backend in self.enabled_backends():
            transaction.add_rules(backend, backend.build_default_tables())    # ???


sudo vi /usr/lib/python3.12/site-packages/firewall/core/fw_transaction.py
line 117, in execute
    raise FirewallError(errors.COMMAND_FAILED, errorMsg)  # !!!
    ...
class FirewallTransaction:
    ...
    def execute(self, enable):
        ...
        rules = self.rules
        ...
        error = False
        errorMsg = ""
        ...
        for backend_name in rules:
            try:
                self.fw.rules(backend_name, rules[backend_name])
            except Exception as msg:
                error = True
                errorMsg = msg
                log.debug1(traceback.format_exc())
                log.error(msg
        ...
        if error:
            ...
            raise FirewallError(errors.COMMAND_FAILED, errorMsg)

$ sudo systemctl status firewalld
○ firewalld.service - firewalld - dynamic firewall daemon
     Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; preset: enabled)
    Drop-In: /usr/lib/systemd/system/service.d
             └─10-timeout-abort.conf
     Active: inactive (dead)
       Docs: man:firewalld(1)

Feb 12 14:37:53 EPBYGOMW0024T4 firewalld[545]: ERROR: Raising SystemExit in run_server
Feb 12 14:42:21 EPBYGOMW0024T4 firewalld[955]: ERROR: 'python-nftables' failed: netlink: Error: cache initialization failed: Operation not permitted

                                               JSON blob:
                                               {"nftables": [{"metainfo": {"json_schema_version": 1}}, {"add": {"table": {"family": "inet", "name": "firewalld"}}}, {"delete": {"table": {"family": "i>
Feb 12 14:42:21 EPBYGOMW0024T4 firewalld[955]: ERROR: Failed to load user configuration. Falling back to full stock configuration.
Feb 12 14:42:21 EPBYGOMW0024T4 firewalld[955]: ERROR: 'python-nftables' failed: netlink: Error: cache initialization failed: Operation not permitted

                                               JSON blob:
                                               {"nftables": [{"metainfo": {"json_schema_version": 1}}, {"add": {"table": {"family": "inet", "name": "firewalld"}}}, {"delete": {"table": {"family": "i>
Feb 12 14:42:21 EPBYGOMW0024T4 firewalld[955]: ERROR: COMMAND_FAILED: 'python-nftables' failed: netlink: Error: cache initialization failed: Operation not permitted

                                               JSON blob:
                                               {"nftables": [{"metainfo": {"json_schema_version": 1}}, {"add": {"table": {"family": "inet", "name": "firewalld"}}}, {"delete": {"table": {"family": "i>
Feb 12 14:42:21 EPBYGOMW0024T4 firewalld[955]: Traceback (most recent call last):
                                                 File "/usr/lib/python3.12/site-packages/firewall/core/fw.py", line 724, in start
                                                   self._start()
                                                 File "/usr/lib/python3.12/site-packages/firewall/core/fw.py", line 692, in _start
                                                   self._start_apply_objects(reload=reload, complete_reload=complete_reload)
                                                 File "/usr/lib/python3.12/site-packages/firewall/core/fw.py", line 583, in _start_apply_objects
                                                   transaction.execute(True)
                                                 File "/usr/lib/python3.12/site-packages/firewall/core/fw_transaction.py", line 117, in execute
                                                   raise FirewallError(errors.COMMAND_FAILED, errorMsg)
                                               firewall.errors.FirewallError: COMMAND_FAILED: 'python-nftables' failed: netlink: Error: cache initialization failed: Operation not permitted

                                               JSON blob:
                                               {"nftables": [{"metainfo": {"json_schema_version": 1}}, {"add": {"table": {"family": "inet", "name": "firewalld"}}}, {"delete": {"table": {"family": "i>

                                               During handling of the above exception, another exception occurred:

                                               Traceback (most recent call last):
                                                 File "/usr/lib/python3.12/site-packages/firewall/core/fw.py", line 734, in start
                                                   self._start_failsafe()
                                                 File "/usr/lib/python3.12/site-packages/firewall/core/fw.py", line 720, in _start_failsafe
                                                   self._start_apply_objects(reload=reload, complete_reload=complete_reload)
                                                 File "/usr/lib/python3.12/site-packages/firewall/core/fw.py", line 583, in _start_apply_objects
                                                   transaction.execute(True)
                                                 File "/usr/lib/python3.12/site-packages/firewall/core/fw_transaction.py", line 117, in execute
                                                   raise FirewallError(errors.COMMAND_FAILED, errorMsg)
                                               firewall.errors.FirewallError: COMMAND_FAILED: 'python-nftables' failed: netlink: Error: cache initialization failed: Operation not permitted

                                               JSON blob:
                                               {"nftables": [{"metainfo": {"json_schema_version": 1}}, {"add": {"table": {"family": "inet", "name": "firewalld"}}}, {"delete": {"table": {"family": "i>
Feb 12 14:42:21 EPBYGOMW0024T4 firewalld[955]: ERROR: COMMAND_FAILED: 'python-nftables' failed: netlink: Error: cache initialization failed: Operation not permitted

                                               JSON blob:
                                               {"nftables": [{"metainfo": {"json_schema_version": 1}}, {"add": {"table": {"family": "inet", "name": "firewalld"}}}, {"delete": {"table": {"family": "i>
Feb 12 14:42:21 EPBYGOMW0024T4 firewalld[955]: ERROR: Failed to load full stock configuration. This likely indicates a system level issue, e.g. the firewall backend (nftables, iptables) is broken. A>
Feb 12 14:42:21 EPBYGOMW0024T4 firewalld[955]: ERROR: 'python-nftables' failed: netlink: Error: cache initialization failed: Operation not permitted

                                               JSON blob:
                                               {"nftables": [{"metainfo": {"json_schema_version": 1}}, {"add": {"table": {"family": "inet", "name": "firewalld"}}}, {"delete": {"table": {"family": "i>
Feb 12 14:42:21 EPBYGOMW0024T4 firewalld[955]: ERROR: Raising SystemExit in run_server