Failed to connect: The URI prefix is not recognized

Support
1

Hello
I’m trying to add a backup destination but I’m getting an error
Failed to connect: The URI prefix is not recognized.
I tried installing Duplicati on a VM and adding the same backup destination and it worked fine I will have Log down below

Request for http://127.0.0.1:8200/api/v1/remoteoperation/test gave error

System.NotSupportedException: The URI prefix is not recognized.
  at System.Net.WebRequest.Create (System.Uri requestUri, System.Boolean useUriBase) [0x000ae] in <9c6e2cb7ddd8473fa420642ddcf7ce48>:0 
  at System.Net.WebRequest.Create (System.String requestUriString) [0x00014] in <9c6e2cb7ddd8473fa420642ddcf7ce48>:0 
  at Duplicati.Library.Backend.WEBDAV.CreateRequest (System.String remotename) [0x00026] in <5df020eccaa84287a3c79d1a4bf95fc9>:0 
  at Duplicati.Library.Backend.WEBDAV.ListWithouExceptionCatch () [0x00000] in <5df020eccaa84287a3c79d1a4bf95fc9>:0 
  at Duplicati.Library.Backend.WEBDAV.List () [0x00000] in <5df020eccaa84287a3c79d1a4bf95fc9>:0 
  at Duplicati.Library.Backend.WEBDAV.Test () [0x00000] in <5df020eccaa84287a3c79d1a4bf95fc9>:0 
  at Duplicati.Server.WebServer.RESTMethods.RemoteOperation.TestConnection (System.String url, Duplicati.Server.WebServer.RESTMethods.RequestInfo info) [0x000b7] in <156011ea63b34859b4073abdbf0b1573>:0 
  at Duplicati.Server.WebServer.RESTMethods.RemoteOperation.POST (System.String key, Duplicati.Server.WebServer.RESTMethods.RequestInfo info) [0x00094] in <156011ea63b34859b4073abdbf0b1573>:0 
  at Duplicati.Server.WebServer.RESTHandler.DoProcess (Duplicati.Server.WebServer.RESTMethods.RequestInfo info, System.String method, System.String module, System.String key) [0x00289] in <156011ea63b34859b4073abdbf0b1573>:0

Reporting error gave error

System.ObjectDisposedException: Can not write to a closed TextWriter.
  at System.IO.StreamWriter.Flush (System.Boolean flushStream, System.Boolean flushEncoder) [0x00008] in <533173d24dae460899d2b10975534bb0>:0 
  at System.IO.StreamWriter.Flush () [0x00006] in <533173d24dae460899d2b10975534bb0>:0 
  at Duplicati.Server.WebServer.RESTHandler.DoProcess (Duplicati.Server.WebServer.RESTMethods.RequestInfo info, System.String method, System.String module, System.String key) [0x003bc] in <156011ea63b34859b4073abdbf0b1573>:0

Duplicati version: 2.0.6.3
OS: Ubuntu 20.04

Thank You

2

Hello and welcome to the forum.

I searched the forum and saw another user with this issue, and it sounds like it may have been related to the version of mono. What version do you have installed?

3

Hello drwtsn32
Thank you for you’re reply
I’m running Mono 6.12.0.122

4

Can you perform the “export as command line” option on this backup job? Exclude passwords and redact sensitive info. What does the URI look like?

5

Hello drwtsn32
Thank you for your reply again

this is the export as command line

mono /usr/lib/duplicati/Duplicati.CommandLine.exe backup "webdavs://example.com/remote.php/webdav/backup?auth-username=backup" /home/user/Desktop/files/ --backup-name=files --dbpath=/home/user/.config/Duplicati/XIGVNDNJFV.sqlite --encryption-module= --compression-module=zip --dblock-size=50mb --no-encryption=true --disable-module=console-password-input