I setup Windows Server and i use the preconfigured client installer script to install the client. The client will start but give me this as an output
ubuntu@ws1:~$ urbackupclientctl status
{
“capability_bits”: 65548,
“finished_processes”: ,
“internet_connected”: true,
“internet_status”: “connected”,
“last_backup_time”: 1756821542,
“running_processes”: ,
“servers”: ,
“time_since_last_lan_connection”: 213642269
}
So even thow it shows no server, it claims to be connected. On the Web Gui of the server the client appears offline.
What is happening here?
As far as i understand the Server only needs 2 configurations set to be able to work over the internet:
Server URL for client file/backup access/browsing: http://backup.server.eu:55414
with Port 55414 as shown in the example value
and under Internet Clients the Server URL clients connect to: urbackup://backup.server.eu
With this set and all ports listed below being open we should be good to go.
I can reach the server GUI, plus the client installer gets pulled from the server and installs fine, still the client doesnt show online. What is wong?
could it be that the client is not working on ubuntu 24.04? Because on 22.04 the connection works, while i cant establish a client - server connection on 24.04. at this point 4 days in……i’m pretty sure i checked everything possible when it comes to firewall, ports etc…
Installation works:
root@mail:~# TF=mktemp && wget “link:55414/x?a=download_client&lang=en&clientid=22&authkey=FEQ3TCdcj9&os=linux” -O $TF && sudo sh $TF; rm -f $TF
–2025-09-05 13:24:12-- link:55414/x?a=download_client&lang=en&clientid=22&authkey=FEQ3TCdcj9&os=linux
Resolving link (link)… connected.
HTTP request sent, awaiting response… 200 ok
Length: 26175201 (25M) [application/octet-stream]
Saving to: ‘/tmp/tmp.bkDUsW4FpG’
/tmp/tmp.bkDUsW4FpG 100%[==================================>] 24.96M 1.38MB/s in 18s
2025-09-05 13:24:31 (1.36 MB/s) - ‘/tmp/tmp.bkDUsW4FpG’ saved [26175201/26175201]
Verifying archive integrity… All good.
Uncompressing UrBackup Client Installer for Linux 100%
Installation of UrBackup Client 2.5.25 to /usr/local … Proceed ? [Y/n]
Uncompressing install data…
Detected Debian (derivative) system
Detected systemd
Detected architecture aarch64-linux-android
Enabling internet only mode
Installed daemon configuration at /etc/default/urbackupclient…
Info: Restoring from web interface is disabled per default. Enable by modifying /etc/default/urbackupclient.
Installing systemd unit…
Created symlink /etc/systemd/system/multi-user.target.wants/urbackupclientbackend.service → /usr/lib/systemd/system/urbackupclientbackend.service.
Starting UrBackup Client service…
Successfully started client service. Installation complete.
+Detected Ubuntu LTS. Dattobd supported
-Detected no btrfs filesystem
-Detected no LVM volumes
+dmsetup present
Please select the snapshot mechanism to be used for backups:
dattobd volume snapshot kernel module from (supports image backups and changed block tracking)
Linux device mapper based snapshots (supports image backups and changed block tracking)
Use no snapshot mechanism. Files will be backed up without creating snapshots of them. Images backups will be not supported.
Enter choice (number 1-5, then enter): 5
Configured no snapshot mechanism
But no connection gets established:
root@mail:~# urbackupclientctl status
{
“capability_bits”: 65548,
“finished_processes”: ,
“internet_connected”: false,
“internet_status”: “connecting_failed”,
“last_backup_time”: 0,
“running_processes”: ,
“servers”: ,
“time_since_last_lan_connection”: 13487495
}
it would be great if there are any logs that would point to the issue but there is nothing. even after 3 days of debuging there is nothing that would help me pinpoint the issue. its not the server, its not the ports, its not the config and not the installer……what is possibly left?
After testing on the exact same virtual machine with differnt OS, i need to say that Ubuntu just doesn’t seem to work. On a Debian Machine i get an instant connection to the Server after install, on Ubuntu 22 and 24 i don’t get any connection. Since i use the exact same method of installing the client, its not an configuration issue, port or firewall issue, it must be something with the client itself.
is there any confirmed working version i can use with ubuntu?
OK i resolved the issue now. the problem is that the client cant resolve DNS. so if you setup server.example.com ubuntu isnt able to connect……even thow all tests like ping etc. resolved to the correct domain, but UrBackup Client isn’t able to get the domain. So i set the Server and all config to only use IPs and now it works fine…..
This is a super annoying bug that cost me 1 week of my life to figure out, lets get this fixed.
