[SOLVED] Failed to start Proxmox Backup API Proxy Server

werter

Well-Known Member
Dec 10, 2017
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9
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Hi.
Can't run PBS on the same host with latest PVE
Please help.

root@pve-01:~# systemctl status proxmox-backup-proxy.service
* proxmox-backup-proxy.service - Proxmox Backup API Proxy Server
Loaded: loaded (/lib/systemd/system/proxmox-backup-proxy.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Tue 2021-11-09 16:18:03 MSK; 2min 37s ago
Process: 30955 ExecStart=/usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-proxy (code=exited, status=1/FAILURE)
Main PID: 30955 (code=exited, status=1/FAILURE)
CPU: 14ms

Nov 09 16:18:03 pve-01 systemd[1]: proxmox-backup-proxy.service: Start request repeated too quickly.
Nov 09 16:18:03 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 09 16:18:03 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 09 16:18:05 pve-01 systemd[1]: proxmox-backup-proxy.service: Start request repeated too quickly.
Nov 09 16:18:05 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 09 16:18:05 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.

root@pve-01:~# cat /lib/systemd/system/proxmox-backup.service
[Unit]
Description=Proxmox Backup API Server
Wants=network-online.target
After=network.target

[Service]
Type=notify
ExecStart=/usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-api
ExecReload=/bin/kill -HUP $MAINPID
PIDFile=/run/proxmox-backup/api.pid
Restart=on-failure

[Install]
WantedBy=multi-user.target


root@pve-01:~# pveversion -v
proxmox-ve: 7.0-2 (running kernel: 5.11.22-7-pve)
pve-manager: 7.0-13 (running version: 7.0-13/7aa7e488)
pve-kernel-helper: 7.1-4
pve-kernel-5.11: 7.0-10
pve-kernel-5.11.22-7-pve: 5.11.22-12
pve-kernel-5.11.22-5-pve: 5.11.22-10
pve-kernel-5.11.22-4-pve: 5.11.22-9
ceph-fuse: 16.2.6-pve2
corosync: 3.1.5-pve1
criu: 3.15-1+pve-1
glusterfs-client: 9.4-2~bpo11+1
ifupdown2: 3.1.0-1+pmx3
ksm-control-daemon: 1.4-1
libjs-extjs: 7.0.0-1
libknet1: 1.22-pve1
libproxmox-acme-perl: 1.4.0
libproxmox-backup-qemu0: 1.2.0-1
libpve-access-control: 7.0-6
libpve-apiclient-perl: 3.2-1
libpve-common-perl: 7.0-12
libpve-guest-common-perl: 4.0-2
libpve-http-server-perl: 4.0-3
libpve-storage-perl: 7.0-13
libspice-server1: 0.14.3-2.1
lvm2: 2.03.11-2.1
lxc-pve: 4.0.9-4
lxcfs: 4.0.8-pve2
novnc-pve: 1.2.0-3
openvswitch-switch: 2.15.0+ds1-8~bpo11+1
proxmox-backup-client: 2.0.13-1
proxmox-backup-file-restore: 2.0.13-1
proxmox-mini-journalreader: 1.2-1
proxmox-widget-toolkit: 3.3-6
pve-cluster: 7.0-3
pve-container: 4.1-1
pve-docs: 7.0-5
pve-edk2-firmware: 3.20210831-1
pve-firewall: 4.2-5
pve-firmware: 3.3-3
pve-ha-manager: 3.3-1
pve-i18n: 2.5-1
pve-qemu-kvm: 6.0.0-4
pve-xtermjs: 4.12.0-1
qemu-server: 7.0-16
smartmontools: 7.2-1
spiceterm: 3.2-2
vncterm: 1.7-1
zfsutils-linux: 2.1.1-pve1

root@pve-01:~# proxmox-backup-manager versions --verbose
proxmox-backup unknown running kernel: 5.11.22-7-pve
proxmox-backup-server 2.0.13-1 running version: 2.0.13
pve-kernel-helper 7.1-4
pve-kernel-5.11 7.0-10
pve-kernel-5.11.22-7-pve 5.11.22-12
pve-kernel-5.11.22-5-pve 5.11.22-10
pve-kernel-5.11.22-4-pve 5.11.22-9
ifupdown2 3.1.0-1+pmx3
libjs-extjs 7.0.0-1
proxmox-backup-docs 2.0.13-1
proxmox-backup-client 2.0.13-1
proxmox-mini-journalreader 1.2-1
proxmox-widget-toolkit 3.3-6
pve-xtermjs 4.12.0-1
smartmontools 7.2-1
zfsutils-linux 2.1.1-pve1
 
Last edited:
please check the log for the first failed start (e.g., with journalctl -b -u proxmox-backup-proxy). in case that indicates some past problem, systemctl reset-failed proxmox-backup-proxy followed by systemctl restart proxmox-backup-proxy should properly restart it. if not, please post the full journal output for that unit...
 
please check the log for the first failed start (e.g., with journalctl -b -u proxmox-backup-proxy). in case that indicates some past problem, systemctl reset-failed proxmox-backup-proxy followed by systemctl restart proxmox-backup-proxy should properly restart it. if not, please post the full journal output for that unit...

Thx for your answer.

root@pve-01:~# journalctl -b -u proxmox-backup-proxy
-- Journal begins at Fri 2021-10-29 12:05:01 MSK, ends at Wed 2021-11-10 10:01:38 MSK. --
Nov 10 09:56:10 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 09:56:10 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 09:56:11 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 09:56:11 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 09:56:11 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 09:56:11 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 09:56:11 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.

systemctl reset-failed proxmox-backup-proxy
root@pve-01:~# systemctl restart proxmox-backup-proxy
Job for proxmox-backup-proxy.service failed because the control process exited with error code.
See "systemctl status proxmox-backup-proxy.service" and "journalctl -xe" for details.

root@pve-01:~# systemctl status proxmox-backup-proxy.service
* proxmox-backup-proxy.service - Proxmox Backup API Proxy Server
Loaded: loaded (/lib/systemd/system/proxmox-backup-proxy.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Wed 2021-11-10 10:04:14 MSK; 38s ago
Process: 5813 ExecStart=/usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-proxy (code=exited, status=1/FAILURE)
Main PID: 5813 (code=exited, status=1/FAILURE)
CPU: 15ms

Nov 10 10:04:14 pve-01 systemd[1]: proxmox-backup-proxy.service: Start request repeated too quickly.
Nov 10 10:04:14 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:04:14 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.

root@pve-01:~# journalctl -xe
-- Subject: A start job for unit proxmox-backup-proxy.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit proxmox-backup-proxy.service has finished with a failure.
--
-- The job identifier is 2465 and the job result is failed.
Nov 10 10:04:14 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit proxmox-backup-proxy.service has entered the 'failed' state with result 'exit-code'.
Nov 10 10:04:14 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
-- Subject: A start job for unit proxmox-backup-proxy.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit proxmox-backup-proxy.service has finished with a failure.
--
-- The job identifier is 2537 and the job result is failed.
Nov 10 10:04:14 pve-01 systemd[1]: proxmox-backup-proxy.service: Start request repeated too quickly.
Nov 10 10:04:14 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit proxmox-backup-proxy.service has entered the 'failed' state with result 'exit-code'.
Nov 10 10:04:14 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
-- Subject: A start job for unit proxmox-backup-proxy.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit proxmox-backup-proxy.service has finished with a failure.
--
-- The job identifier is 2609 and the job result is failed.

The same :(

Try to run line from /lib/systemd/system/proxmox-backup-proxy.service (ExecStart=/usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-proxy).
root@pve-01:~# /usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-proxy
Error: proxy not running as backup user or group (got uid 0 gid 0)

root@pve-01:~# id backup
uid=34(backup) gid=34(backup) groups=34(backup),26(tape)

Guys, what's wrong? LATEST PVE with the LATEST PBS - and this (
 
Last edited:
root@pve-01:~# proxmox-backup-manager versions --verbose
proxmox-backup unknown running kernel: 5.11.22-7-pve
proxmox-backup-server 2.0.13-1 running version: 2.0.13
pve-kernel-helper 7.1-4
pve-kernel-5.11 7.0-10
pve-kernel-5.11.22-7-pve 5.11.22-12
pve-kernel-5.11.22-5-pve 5.11.22-10
pve-kernel-5.11.22-4-pve 5.11.22-9
ifupdown2 3.1.0-1+pmx3
libjs-extjs 7.0.0-1
proxmox-backup-docs 2.0.13-1
proxmox-backup-client 2.0.13-1
proxmox-mini-journalreader 1.2-1
proxmox-widget-toolkit 3.3-6
pve-xtermjs 4.12.0-1
smartmontools 7.2-1
zfsutils-linux 2.1.1-pve1

Why proxmox-backup has unknown version ?
 
Last edited:
root@pve-01:~# apt search proxmox-backup
Sorting... Done
Full Text Search... Done
libproxmox-backup-qemu0/stable,now 1.2.0-1 amd64 [installed]
Proxmox Backup Server client library for QEMU

libproxmox-backup-qemu0-dbgsym/stable 1.2.0-1 amd64
debug symbols for libproxmox-backup-qemu0

libproxmox-backup-qemu0-dev/stable 1.2.0-1 amd64
Proxmox Backup Server client library for QEMU development files

proxmox-backup/stable 2.0-1 all
Proxmox Backup Server metapackage
...


Make apt install -y proxmox-backup. Why this pkg don't automaticalliy installed with proxmox-backup-server pkg ?
Reboot.

But the same again (

root@pve-01:~# systemctl reset-failed proxmox-backup-proxy

root@pve-01:~# systemctl restart proxmox-backup-proxy.service
Job for proxmox-backup-proxy.service failed because the control process exited with error code.
See "systemctl status proxmox-backup-proxy.service" and "journalctl -xe" for details.

root@pve-01:~# systemctl status proxmox-backup-proxy.service
* proxmox-backup-proxy.service - Proxmox Backup API Proxy Server
Loaded: loaded (/lib/systemd/system/proxmox-backup-proxy.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Wed 2021-11-10 10:34:19 MSK; 46s ago
Process: 4005 ExecStart=/usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-proxy (code=exited, status=1/FAILURE)
Main PID: 4005 (code=exited, status=1/FAILURE)
CPU: 13ms

Nov 10 10:34:19 pve-01 systemd[1]: proxmox-backup-proxy.service: Start request repeated too quickly.
Nov 10 10:34:19 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:34:19 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.

root@pve-01:~# journalctl -xe
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit proxmox-backup-proxy.service has finished with a failure.
--
-- The job identifier is 2448 and the job result is failed.
Nov 10 10:34:19 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit proxmox-backup-proxy.service has entered the 'failed' state with result 'exit-code'.
Nov 10 10:34:19 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
-- Subject: A start job for unit proxmox-backup-proxy.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit proxmox-backup-proxy.service has finished with a failure.
--
-- The job identifier is 2520 and the job result is failed.
Nov 10 10:34:19 pve-01 systemd[1]: proxmox-backup-proxy.service: Start request repeated too quickly.
Nov 10 10:34:19 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit proxmox-backup-proxy.service has entered the 'failed' state with result 'exit-code'.
Nov 10 10:34:19 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
-- Subject: A start job for unit proxmox-backup-proxy.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit proxmox-backup-proxy.service has finished with a failure.
--
-- The job identifier is 2592 and the job result is failed.
 
Try to reinstall PVE globally.
But :(

...
Created symlink /etc/systemd/system/getty.target.wants/proxmox-backup-banner.service -> /lib/systemd/system/proxmox-backup-banner.service.
Created symlink /etc/systemd/system/multi-user.target.wants/proxmox-backup-proxy.service -> /lib/systemd/system/proxmox-backup-proxy.service.
Created symlink /etc/systemd/system/multi-user.target.wants/proxmox-backup.service -> /lib/systemd/system/proxmox-backup.service.
Job for proxmox-backup-proxy.service failed because the control process exited with error code.
See "systemctl status proxmox-backup-proxy.service" and "journalctl -xe" for details.

...
 
the proxmox-backup package is just a meta package pulling in proxmox-backup-server and the kernel packages and so on. it's not strictly needed (when running in a container, just proxmox-backup-server is enough).

you need to get the log from the unit initially failing instead of when it fails because it already failed too often too quickly ;)

run in one shell, keep running until the other shell's commands are done, then Ctrl+C and copy output here:
Code:
journalctl -f

run in another shell

Code:
systemctl reset-failed proxmox-backup-proxy
systemctl restart proxmox-backup-proxy
 
root@pve-01:~# journalctl -f
-- Journal begins at Fri 2021-10-29 12:05:01 MSK. --
Nov 10 10:49:06 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 10:49:07 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:49:07 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 10:49:07 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:49:07 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 10:49:07 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:49:07 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 10:49:07 pve-01 systemd[1]: proxmox-backup-proxy.service: Start request repeated too quickly.
Nov 10 10:49:07 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:49:07 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 10:50:22 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:50:22 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 10:50:22 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:50:22 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 10:50:22 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:50:22 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 10:50:23 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:50:23 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 10:50:23 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:50:23 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 10 10:50:23 pve-01 systemd[1]: proxmox-backup-proxy.service: Start request repeated too quickly.
Nov 10 10:50:23 pve-01 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 10 10:50:23 pve-01 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
^C
 
root@pve-01:~# cat /lib/systemd/system/proxmox-backup-proxy.service
[Unit]
Description=Proxmox Backup API Proxy Server
Wants=network-online.target
After=network.target
Wants=proxmox-backup.service
After=proxmox-backup.service

[Service]
Type=notify
ExecStart=/usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-proxy
ExecReload=/bin/kill -HUP $MAINPID
PIDFile=/run/proxmox-backup/proxy.pid
Restart=on-failure
User=backup
Group=backup

[Install]
WantedBy=multi-user.target

root@pve-01:~# ls -ahl /usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-proxy
-rwxr-xr-x 1 root root 20M Oct 21 09:17 /usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-proxy

Is it right?

root@pve-01:~# systemctl status proxmox-backup
* proxmox-backup.service - Proxmox Backup API Server
Loaded: loaded (/lib/systemd/system/proxmox-backup.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2021-11-10 10:42:33 MSK; 14min ago
Main PID: 7594 (proxmox-backup-)
Tasks: 5 (limit: 18997)
Memory: 7.3M
CPU: 1.318s
CGroup: /system.slice/proxmox-backup.service
`-7594 /usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-api
 
Last edited:
yeah, that looks okay. can you try running it manually in the foreground?

Code:
systemctl stop proxmox-backup-proxy
runuser -u backup -g backup /usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-proxy
 
root@pve-01:~# systemctl stop proxmox-backup-proxy
root@pve-01:~# runuser -u backup -g backup /usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-proxy
Error: unable to create rrdb stat dir - EACCES: Permission denied
 
Last edited:
Solved:

https://forum.proxmox.com/threads/e...-clean-pbs-v2-installation.99395/#post-429098
mkdir -vp /var/lib/proxmox-backup/rrdb
chown -Rv backup:backup /var/lib/proxmox-backup/rrdb
systemctl reset-failed proxmox-backup-proxy
systemctl restart proxmox-backup-proxy

root@pve-01:~# systemctl status proxmox-backup-proxy
* proxmox-backup-proxy.service - Proxmox Backup API Proxy Server
Loaded: loaded (/lib/systemd/system/proxmox-backup-proxy.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2021-11-10 11:11:51 MSK; 2s ago
Main PID: 14004 (proxmox-backup-)
Tasks: 6 (limit: 18997)
Memory: 4.5M
CPU: 21ms
CGroup: /system.slice/proxmox-backup-proxy.service
`-14004 /usr/lib/x86_64-linux-gnu/proxmox-backup/proxmox-backup-proxy


Fix this problem in the next release, please.
And thx for your job, guys :)
 
Last edited:
Having the same issue installing PBS on same PVE server


Nov 28 16:40:45 ba1 systemd[1]: Starting Proxmox Backup API Proxy Server...
Nov 28 16:40:45 ba1 proxmox-backup-proxy[8638]: apply old journal log rrd.journal-6384726f
Nov 28 16:40:45 ba1 proxmox-backup-proxy[8638]: Error: Address family not supported by protocol (os error 97)
Nov 28 16:40:45 ba1 systemd[1]: proxmox-backup-proxy.service: Main process exited, code=exited, status=1/FAILURE
Nov 28 16:40:45 ba1 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 28 16:40:45 ba1 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 28 16:40:45 ba1 systemd[1]: proxmox-backup-proxy.service: Scheduled restart job, restart counter is at 1.
Nov 28 16:40:45 ba1 systemd[1]: Stopped Proxmox Backup API Proxy Server.
Nov 28 16:40:45 ba1 systemd[1]: Starting Proxmox Backup API Proxy Server...
Nov 28 16:40:45 ba1 proxmox-backup-proxy[8709]: apply old journal log rrd.journal-6384726f
Nov 28 16:40:45 ba1 proxmox-backup-proxy[8709]: Error: Address family not supported by protocol (os error 97)
Nov 28 16:40:45 ba1 systemd[1]: proxmox-backup-proxy.service: Main process exited, code=exited, status=1/FAILURE
Nov 28 16:40:45 ba1 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 28 16:40:45 ba1 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 28 16:40:45 ba1 systemd[1]: proxmox-backup-proxy.service: Scheduled restart job, restart counter is at 2.
Nov 28 16:40:45 ba1 systemd[1]: Stopped Proxmox Backup API Proxy Server.
Nov 28 16:40:46 ba1 systemd[1]: Starting Proxmox Backup API Proxy Server...
Nov 28 16:40:46 ba1 proxmox-backup-proxy[8778]: apply old journal log rrd.journal-6384726f
Nov 28 16:40:46 ba1 proxmox-backup-proxy[8778]: Error: Address family not supported by protocol (os error 97)
Nov 28 16:40:46 ba1 systemd[1]: proxmox-backup-proxy.service: Main process exited, code=exited, status=1/FAILURE
Nov 28 16:40:46 ba1 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 28 16:40:46 ba1 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 28 16:40:46 ba1 systemd[1]: proxmox-backup-proxy.service: Scheduled restart job, restart counter is at 3.
Nov 28 16:40:46 ba1 systemd[1]: Stopped Proxmox Backup API Proxy Server.
Nov 28 16:40:46 ba1 systemd[1]: Starting Proxmox Backup API Proxy Server...
Nov 28 16:40:46 ba1 proxmox-backup-proxy[8847]: apply old journal log rrd.journal-6384726f
Nov 28 16:40:46 ba1 proxmox-backup-proxy[8847]: Error: Address family not supported by protocol (os error 97)
Nov 28 16:40:46 ba1 systemd[1]: proxmox-backup-proxy.service: Main process exited, code=exited, status=1/FAILURE
Nov 28 16:40:46 ba1 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 28 16:40:46 ba1 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 28 16:40:46 ba1 systemd[1]: proxmox-backup-proxy.service: Scheduled restart job, restart counter is at 4.
Nov 28 16:40:46 ba1 systemd[1]: Stopped Proxmox Backup API Proxy Server.
Nov 28 16:40:46 ba1 systemd[1]: Starting Proxmox Backup API Proxy Server...
Nov 28 16:40:46 ba1 proxmox-backup-proxy[8923]: apply old journal log rrd.journal-6384726f
Nov 28 16:40:46 ba1 proxmox-backup-proxy[8923]: Error: Address family not supported by protocol (os error 97)
Nov 28 16:40:46 ba1 systemd[1]: proxmox-backup-proxy.service: Main process exited, code=exited, status=1/FAILURE
Nov 28 16:40:46 ba1 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 28 16:40:46 ba1 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 28 16:40:46 ba1 pve-firewall[2236]: status update error: iptables_restore_cmdlist: Try `ip6tables-restore -h' or 'ip6tables-restore --help' for more information.
Nov 28 16:40:46 ba1 systemd[1]: proxmox-backup-proxy.service: Scheduled restart job, restart counter is at 5.
Nov 28 16:40:46 ba1 systemd[1]: Stopped Proxmox Backup API Proxy Server.
Nov 28 16:40:46 ba1 systemd[1]: proxmox-backup-proxy.service: Start request repeated too quickly.
Nov 28 16:40:46 ba1 systemd[1]: proxmox-backup-proxy.service: Failed with result 'exit-code'.
Nov 28 16:40:46 ba1 systemd[1]: Failed to start Proxmox Backup API Proxy Server.
Nov 28 16:40:56 ba1 pve-firewall[2236]: status update error: iptables_restore_cmdlist: Try `ip6tables-restore -h' or 'ip6tables-restore --help' for more information.
 
that looks like a different error (but also on causing a failing start). did you manually disable ipv6 somehow?
 
can reproduce the issue - PBS currently tries to bind to "::" which doesn't work if IPv6 is disabled entirely. as a workaround, you could just disable assigning ipv6 addresses, instead of disabling the full ipv6 stack:

ipv6.disable_ipv6=1

should do the trick.
 
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