Hi,
I’ve just realized that my clients wasn’t up-to-date of the last 2.4.11-cbt client : they are still 2.4.10-cbt. Server is 2.4.13 with correct server_update_location.url under /var/urbackup.
After tracing on proxy, we can observe the sequence :
04/Mar/2021:11:10:09 +0100 190 192.168.10.10 TCP_REFRESH_MODIFIED/200 485 GET http://cbt.urbackup.com/autoupdate/MY_GUID/2.4.x/version.txt - HIER_DIRECT/cbt.urbackup.com text/plain
04/Mar/2021:11:10:09 +0100 103 192.168.10.10 TCP_MISS/302 609 GET http://cbt.urbackup.com/autoupdate/MY_GUID/2.4.x/version_linux.txt - HIER_DIRECT/cbt.urbackup.com text/html
04/Mar/2021:11:10:09 +0100 0 192.168.10.10 TCP_MEM_HIT/200 327 GET http://update.urbackup.org/2.4.x/version_linux.txt - HIER_NONE/- text/plain
04/Mar/2021:11:10:09 +0100 103 192.168.10.10 TCP_MISS/302 648 GET http://cbt.urbackup.com/autoupdate/MY_GUID/2.4.x/server_version_info.properties - HIER_DIRECT/cbt.urbackup.com text/html
04/Mar/2021:11:10:09 +0100 113 192.168.10.10 TCP_REFRESH_UNMODIFIED/200 348 GET http://update.urbackup.org/2.4.x/server_version_info.properties - HIER_DIRECT/update.urbackup.org -
04/Mar/2021:11:10:09 +0100 102 192.168.10.10 TCP_MISS/302 603 GET http://cbt.urbackup.com/autoupdate/MY_GUID/2.4.x/dataplan_db.txt - HIER_DIRECT/cbt.urbackup.com text/html
04/Mar/2021:11:10:09 +0100 60 192.168.10.10 TCP_MISS/301 654 GET http://update.urbackup.org/2.4.x/dataplan_db.txt - HIER_DIRECT/update.urbackup.org text/html
04/Mar/2021:11:10:09 +0100 94 192.168.10.10 TCP_REFRESH_MODIFIED/200 472 GET http://dataplandb.urbackup.org/dataplan_db.txt - HIER_DIRECT/dataplandb.urbackup.org text/plain
Proxy is also defined correctly in /etc/default/urbackup
Regards