Interoperability failure unrecoginzed_name when connecting to Synology Webdav server

[fjanvier]

Impossible to connect to our Webdav server using https and a dedicated port. I receive a Windows system error message : "Echec d'interoperabilité"

Related information :

• Our certificate is a valid LetsEncrypt certificate.
• Expandrive and NetDrive are connecting successfuly.
• Also occurs on Windows 7

Extract from the MountainDuck log file. Note: I replaced login and server information by <MYLOGIN> and <MYSERVER>

2016-06-01 12:15:43,200 [Thread-1] INFO  ch.iterate.mountainduck.fs.PooledSessionFilesystem - Create new session for host Host{credentials=Credentials{user='<MYLOGIN>'}, hostname='<MYSERVER>', defaultpath='Users', port=5006, protocol=davs} in pool SessionPool{host=Host{credentials=Credentials{user='<MYLOGIN>'}, hostname='<MYSERVER>', defaultpath='Users', port=5006, protocol=davs}}
2016-06-01 12:15:43,209 [Thread-1] INFO  ch.iterate.mountainduck.fs.PooledSessionFilesystem - Borrow session Session{host=Host{credentials=Credentials{user='<MYLOGIN>'}, hostname='<MYSERVER>', defaultpath='Users', port=5006, protocol=davs}, state=closed} from pool GenericObjectPool{configuration=GenericObjectPoolConfig{maxTotal=2147483647, maxIdle=5}, numActive=1, numIdle=0}
2016-06-01 12:15:43,215 [Thread-1] INFO  ch.iterate.mountainduck.fs.PooledSessionFilesystem - Release session Session{host=Host{credentials=Credentials{user='<MYLOGIN>'}, hostname='<MYSERVER>', defaultpath='Users', port=5006, protocol=davs}, state=closed} to pool GenericObjectPool{configuration=GenericObjectPoolConfig{maxTotal=2147483647, maxIdle=5}, numActive=1, numIdle=0}
2016-06-01 12:15:43,215 [background-3] INFO  ch.iterate.mountainduck.fs.FilesystemMountRegistry - Mount bookmark Host{credentials=Credentials{user='<MYLOGIN>'}, hostname='<MYSERVER>', defaultpath='Users', port=5006, protocol=davs} with in Local{path='I:\'}
2016-06-01 12:15:43,351 [Thread-12] WARN  ch.iterate.mountainduck.fs.SessionFilesystem - Finalize file system callback SessionFilesystem{bookmark=Host{credentials=Credentials{user='<MYLOGIN>'}, hostname='<MYSERVER>', defaultpath='Users', port=5006, protocol=davs}, autoClose=false, controller=ch.iterate.mountainduck.fs.FilesystemController@24d63b}
2016-06-01 12:15:43,793 [background-3] INFO  ch.iterate.mountainduck.fs.FilesystemMountRegistry - Unmount bookmark Host{credentials=Credentials{user='<MYLOGIN>'}, hostname='<MYSERVER>', defaultpath='Users', port=5006, protocol=davs} in SessionFilesystem{bookmark=Host{credentials=Credentials{user='<MYLOGIN>'}, hostname='<MYSERVER>', defaultpath='Users', port=5006, protocol=davs}, autoClose=false, controller=ch.iterate.mountainduck.fs.FilesystemController@11f5d99}
2016-06-01 12:15:43,820 [background-3] WARN  ch.iterate.mountainduck.fs.FilesystemMountRegistry - Failed to remove Host{credentials=Credentials{user='<MYLOGIN>'}, hostname='<MYSERVER>', defaultpath='Users', port=5006, protocol=davs} from registry

[fjanvier]

Displayed error message

[fjanvier]

Updated to CyberDuck 5.0 and have the same problem

[dkocher]

This issue is documented in ​https://trac.cyberduck.io/wiki/help/en/howto/dav#InteroperabilityfailureHandshakealert:unrecognized_name .

[dkocher]

Duplicate for #7908. Please fix the server configuration following the instructions in the above link.

[fjanvier]

As Expandrive and NetDrive have found a workaround to handle the problem silently, I suggest you to either use a similar workaround or advise users.

For the FAQ : Synology WebDAV are "by default" configured without specifying any ServerAlias. To solve this issue : Edit file /var/packages/WebDAVServer/target/etc/httpd/conf/extra/httpd-ssl.conf-webdav

And add a ServerAlias my.certifdicate.name line using your domain certificate or a generic ServerAlias *

As an example, should look like :

<VirtualHost *:5006>
    ServerAlias my.certificate.name
    SSLEngine on

    <FilesMatch "\.(cgi|shtml|phtml|php)$">
        SSLOptions +StdEnvVars
    </FilesMatch>

    BrowserMatch ".*MSIE [2-5]\..*" nokeepalive ssl-unclean-shutdown downgrade-1.0 force-response-1.0
    CustomLog /dev/null "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b"
</VirtualHost>

[dkocher]

Replying to fjanvier:

Thanks for adding the sample configuration!