Secure connection (https, Port 5006) with WebDav Server dosn't work, unsecure does (http, Port 5005)

Trying to setup a secure connection to my server (port 5006) using WebDav on NetDrive3 to my Synology server. Port 5006 is open on all routers and on Synology NAS. I get constantly error: Check your server setup.
Same setup, but using an unsecure connection through port 5005 works fine.

Dear 3899-info,

Thank you for using NetDrive.

Did you check “Use SSL(https)” checkbox when creating the drive item?

If you issue persists, please attach a log file to find clues to the problem.

After setting the log level to VERBOSE, please reproduce the problem and send us the debug log file :

There is no credential information in the log files.

Sorry for the inconvenience it may caused.

Stay healthy.


Here is the Logfile of the problem

nd3svc_SCO Handel (9.88 MB)

Dear 3899-info,

I’ve checked your log files and found a clue to the problem.

[2018/05/02 15:37:25.511] [ERROR ] [ 14220] [PROTOCOL ] Protocol::Connect >> ON HTTP 401 : AERROR::ACCESS_DENIED(0x00000018)

The content of the connect result is below.

401 Authorization Required

Authorization Required

This server could not verify that you are authorized to access the document requested. Either you supplied the wrong credentials (e.g., bad password), or your browser doesn’t understand how to supply the credentials required.

Could you check your ip is in block list of Synology NAS Server or not.

Please refer to the following topic.

If you issue persists, please let me know.