whenever I'm trying to open my password store via WEBDAV (https://server:443/data/file.kdbx) I get the following error (KeePass v2.27):
"The underlying connection was closed: An unexpected error occurred on a send.
Received an unexpected EOD or 0 bytes from the transport stream."
Since it has been working in the past I'm not sure what's causing this error. I'm using a Synology NAS (DSM 5.0-4493 Update 2).
Is there any way I can get additional details / logging from the program?
This may not be valid but the URL you posted isn't correct. It should read https://server/data/file.kdbx. Assuming this isn't the problem are you able to read the file via Windows Explorer or Internet Explorer? It's also worth trying non-https, http://server/data/file.kdbx
thanks for your feedback. Actually the URL should be fine. I'm using it also in order to synchronize my password store with the Keepass2Android application - which works just fine.
It definitely is a HTTPS connection so HTTP is not working. Also removing the port-number does not change anything.
Can you open the URL from Windows Explorer on the PC where KeePass fails?
When I paste the URL into the Explorer it opens Firefox. After entering username/password I can download the file. The new beta of WinSCP (5.6) is also working fine with WebDAV.
I was thinking that maybe KeePass is having problems with the Proxy server that is used (it's a corporate network; configured via PAC-file). The configuration is set to "Use system proxy settings". Manually configuring the respective Proxy-settings in KeePass does also fail.
Without server / firewall logs it's hard to determine, but corporate firewalls are notoriously tricky to configure with non-standard apps.