9.4 director, 11 client...

We are currently upgrading our servers, and we have still the director (and
SD) on bacula 9.4 (debian packages). Upgrade is in project but currently non
in place.

We have added some RH (OL9, precisly) clients/FD, that came with bacula 11:
but seems that 9.4 director cannot connect to 11 client:

 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: bnet_server.c:235-0 Accept socket=10.35.5.150.9102:10.7.5.41.38200 s=0x5587e2248388
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: authenticate.c:67-0 authenticate dir: Hello Director lnfbacula-dir calling 103
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: authenticatebase.cc:365-0 TLSPSK Remote need 0
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: authenticate.c:90-0 *** No FD compression to DIR
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: authenticatebase.cc:335-0 TLSPSK Local need 0
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: cram-md5.c:68-0 send: auth cram-md5 challenge <34614955.1771603547@ven-sd-sdfs1-fd> ssl=0
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: cram-md5.c:156-0 sending resp to challenge: 47+lIE+rX8cdh61Ot4+yTD
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: events.c:48-0 Events: code=FC0002 daemon=ven-sd-sdfs1-fd ref=0x7f87c400b328 type=connection source=lnfbacula-dir text=Director connection
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: fd_plugins.c:1665-0 Instantiate plugin_ctx=7f87c400fb18 JobId=0
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: cdp-fd.c:369-0 Working Directory: /var/spool/bacula
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: fd_plugins.c:250-0 plugin_ctx=7f87c400fb18 JobId=0
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: fd_plugins.c:143-0 name=<NULL> len=0 plugin=bpipe-fd.so plen=5
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: fd_plugins.c:143-0 name=<NULL> len=0 plugin=cdp-fd.so plen=3
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: cdp-fd.c:410-0 Job Name: backup_job
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: fd_plugins.c:250-0 plugin_ctx=7f87c400fb18 JobId=0
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: fd_plugins.c:143-0 name=<NULL> len=0 plugin=bpipe-fd.so plen=5
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: fd_plugins.c:143-0 name=<NULL> len=0 plugin=cdp-fd.so plen=3
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: events.c:48-0 Events: code=FC0001 daemon=ven-sd-sdfs1-fd ref=0x7f87c400b328 type=connection source=lnfbacula-dir text=Director disconnection
 20-Feb-2026 17:05:47 ven-sd-sdfs1-fd: fd_plugins.c:1700-0 Free instance plugin_ctx=7f87c400fb18 JobId=0

I've tried to add to client configuration:

	TLS PSK Enable = no

but nothing changed.


I'm doing something wrong, or there's a 'compatibility knob' somewhere i can
turn on?


Thanks.

--