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WebDAV - add certificate handling #517

mr-flibble opened this issue Nov 11, 2018 · 3 comments


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commented Nov 11, 2018

I tried connect to WebDAV on Synology but Duplicacy always stuck for couple of minutes and then gave error:
ERROR Failed to load the WebDAV storage at webdav:// Maximum backoff reached

So I tried -debug parameter and I got:
URL request 'PROPFIND folder/' returned an error (Propfind x509: certificate has expired or is not yet valid)

So my cert was expired

I also tried it with default Synology selfsigned certificate:
same Maximum backoff reached error.
But debug shows URL request 'PROPFIND folder/' returned an error (Propfind x509: certificate signed by unknown authority)

So Duplicacy is missing:

  • Error/warning when cert is invalid or untrusted
    (the current behavior is that Duplicacy is stuck fo approx 5 minutes and show generic error)
  • Parameter to ignore error, something like "-accept-any-ssl-certificate"

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commented Nov 14, 2018

Duplicacy expects root certificates to be at one of the following locations (from

var certFiles = []string{
	"/etc/ssl/certs/ca-certificates.crt",                // Debian/Ubuntu/Gentoo etc.
	"/etc/pki/tls/certs/ca-bundle.crt",                  // Fedora/RHEL 6
	"/etc/ssl/ca-bundle.pem",                            // OpenSUSE
	"/etc/pki/tls/cacert.pem",                           // OpenELEC
	"/etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem", // CentOS/RHEL 7

Please check these locations, and if there are, check if they are valid.


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commented Nov 14, 2018

Thanks for reply.
I'm using Windows.
I tried add Synology selfigned cert to "Trusted root certificate authorities" but error was same.

When I install valid let's encrypt cert, webdav connection works.


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commented Dec 22, 2018

Only workaround I managed find is:
(for WEBDAV on Synology)

  • Use domain name and not IP address
  • Create new selfigned certificate with domain name in Synology (root CA cert is also created)
  • Add root CA cert to Trusted root certificate authorities
    After this, init command works:
    duplicacy_win_x64_2.1.2.exe -d init syno webdav://
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