Docker: Client.Timeout exceeded while awaiting headers

Greetings,

it isn’t possible to install any service at the moment, docker generates a timeout no matter the software being pulled:

Waiting for activation of the extension object jitsimeet: OK
Registering attribute jitsimeetActivated
Registering the container host jitsi-19185904 for jitsimeet
Downloading app images
Running command: docker-compose -p jitsimeet pull
Pulling web     ... error
Pulling prosody ... error
Pulling jicofo  ... error
Pulling jvb     ... error

ERROR: for jicofo  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

ERROR: for prosody  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

ERROR: for web  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

ERROR: for jvb  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Pulling web     ... error
Pulling prosody ... error
Pulling jicofo  ... error
Pulling jvb     ... error

ERROR: for jicofo  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

ERROR: for prosody  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

ERROR: for web  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

ERROR: for jvb  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers) (1)
Pulling web     ... error
Pulling prosody ... error
Pulling jicofo  ... error
Pulling jvb     ... error

ERROR: for jicofo  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

ERROR: for prosody  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

ERROR: for web  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

ERROR: for jvb  Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

Aborting...
Resolving dependencies for jitsimeet
Going to remove Jitsi Meet (stable-8960-1)
Showing README for jitsimeet=stable-8960-1
Configuring jitsimeet=stable-8960-1
Unsetting security/packetfilter/package/jitsimeet/tcp/4443/all
Unsetting security/packetfilter/package/jitsimeet/tcp/4443/all/en
Unsetting security/packetfilter/package/jitsimeet/tcp/10000/all
Unsetting security/packetfilter/package/jitsimeet/tcp/10000/all/en
Unsetting security/packetfilter/package/jitsimeet/udp/10000/all
Unsetting security/packetfilter/package/jitsimeet/udp/10000/all/en
File: /etc/security/packetfilter.d/80_univention-firewall_policy.sh
File: /etc/security/packetfilter.d/10_univention-firewall_start.sh
Configuring jitsimeet=stable-8960-1
Removing network jitsimeet_meet.jitsi
Network jitsimeet_meet.jitsi not found.
Removing localhost from LDAP object
Multifile: /etc/apache2/sites-available/000-default.conf
Multifile: /etc/apache2/sites-available/default-ssl.conf
File: /etc/univention/service.info/services/univention-appcenter.cfg
Reloading apache2 configuration (via systemctl): apache2.service.
Installing join script /var/cache/univention-appcenter/appcenter.software-univention.de/5.0/jitsimeet_20231016165400.uinst
Search LDAP binddn:  done
Running pre-joinscripts hook(s):  done
Running 01univention-ldap-server-init.inst skipped (already executed)
Running 03univention-directory-listener.inst skipped (already executed)
Running 04univention-ldap-client.inst skipped (already executed)
Running 05univention-bind.inst skipped (already executed)
Running 08univention-apache.inst skipped (already executed)
Running 10univention-ldap-server.inst skipped (already executed)
Running 11univention-heimdal-init.inst skipped (already executed)
Running 11univention-pam.inst skipped (already executed)
Running 15univention-heimdal-kdc.inst skipped (already executed)
Running 18python-univention-directory-manager.inst skipped (already executed)
Running 20univention-directory-policy.inst skipped (already executed)
Running 20univention-join.inst skipped (already executed)
Running 26univention-nagios-common.inst skipped (already executed)
Running 30univention-appcenter.inst skipped (already executed)
Running 30univention-monitoring-client.inst skipped (already executed)
Running 30univention-nagios-client.inst skipped (already executed)
Running 31univention-monitoring-s4-connector.inst skipped (already executed)
Running 31univention-monitoring-samba.inst skipped (already executed)
Running 31univention-nagios-s4-connector.inst skipped (already executed)
Running 31univention-nagios-samba.inst skipped (already executed)
Running 33univention-portal.inst skipped (already executed)
Running 35univention-appcenter-docker.inst skipped (already executed)
Running 35univention-management-console-module-appcenter.inst skipped (already executed)
Running 35univention-management-console-module-diagnostic.inst skipped (already executed)
Running 35univention-management-console-module-join.inst skipped (already executed)
Running 35univention-management-console-module-lib.inst skipped (already executed)
Running 35univention-management-console-module-quota.inst skipped (already executed)
Running 35univention-management-console-module-reboot.inst skipped (already executed)
Running 35univention-management-console-module-services.inst skipped (already executed)
Running 35univention-management-console-module-setup.inst skipped (already executed)
Running 35univention-management-console-module-sysinfo.inst skipped (already executed)
Running 35univention-management-console-module-top.inst skipped (already executed)
Running 35univention-management-console-module-ucr.inst skipped (already executed)
Running 35univention-management-console-module-updater.inst skipped (already executed)
Running 36univention-management-console-module-apps.inst skipped (already executed)
Running 81univention-nfs-server.inst skipped (already executed)
Running 90univention-bind-post.inst skipped (already executed)
Running 92univention-management-console-web-server.inst skipped (already executed)
Running 96univention-samba4.inst skipped (already executed)
Running 97univention-s4-connector.inst skipped (already executed)
Running 98univention-pkgdb-tools.inst skipped (already executed)
Running 98univention-samba4-dns.inst skipped (already executed)
Running 98univention-samba4-saml-kerberos.inst skipped (already executed)
Running 51jitsimeet-uninstall.uinst done
Running post-joinscripts hook(s):  done
Potential script hook folder is unused: /var/lib/univention-appcenter/apps/jitsimeet/local/hooks/post-remove.d

The machine has internet access and DNS queries work otherwise without issue:

root@ucs01:~# dig +short docker.software-univention.de
176.9.110.24
root@ucs01:~# ping -c10 docker.software-univention.de
PING docker.software-univention.de (176.9.110.24) 56(84) bytes of data.
64 bytes from download2.software-univention.de (176.9.110.24): icmp_seq=1 ttl=56 time=24.6 ms
64 bytes from download2.software-univention.de (176.9.110.24): icmp_seq=2 ttl=56 time=23.9 ms
64 bytes from download2.software-univention.de (176.9.110.24): icmp_seq=3 ttl=56 time=23.8 ms
64 bytes from download2.software-univention.de (176.9.110.24): icmp_seq=4 ttl=56 time=23.8 ms
64 bytes from download2.software-univention.de (176.9.110.24): icmp_seq=5 ttl=56 time=24.2 ms
64 bytes from download2.software-univention.de (176.9.110.24): icmp_seq=6 ttl=56 time=23.7 ms
64 bytes from download2.software-univention.de (176.9.110.24): icmp_seq=7 ttl=56 time=23.6 ms
64 bytes from download2.software-univention.de (176.9.110.24): icmp_seq=8 ttl=56 time=23.5 ms
64 bytes from download2.software-univention.de (176.9.110.24): icmp_seq=9 ttl=56 time=23.8 ms
64 bytes from download2.software-univention.de (176.9.110.24): icmp_seq=10 ttl=56 time=24.5 ms

--- docker.software-univention.de ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 25ms
rtt min/avg/max/mdev = 23.525/23.937/24.558/0.356 ms

UCS version:

version/erratalevel: 857
version/patchlevel: 5
version/version: 5.0

Are there known issues with the docker target host at the moment?

Kind regards,

Frank

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