WebDAV Authentication Stopped Working

DEVONthink
1

Ok, I don’t know what happened here, but I’m in a bad spot because WebDAV authentication stopped working for me. And it happened at the worst possible time insofar as I’m away from home and traveling with my iPad, iPhone, and super-old MacBook Pro, all of which worked fine with my setup when I left. They kept working after I got to where I’m staying too, only today I started having issues. Let me explain my setup:

  1. I have an old iMac at home that’s my “master” which syncs all its databases to a local NAS via WebDAV. That’s working fine.
  2. I then have all of my mobile devices (iPad, iPhone, MacBook Pro) set up to connect to that same WebDAV store remotely via HTTPS on a custom port.
  3. I got my iPad Pro working again by uninstalling and reinstalling the app, the reconfiguring the sync options completely. That now works just fine.
  4. But when I use all the same information that worked for my iPad for my iPhone and my MacBook Pro, I get “Error while setting up location ‘DEVONthink.dtCloud’. Authentication failed.” whenever I try to get those devices working.

I’ve deleted and recreated that WebDAV folder, completely uninstalled and reinstalled the DTTG 3.x app on my iPhone and DEVONthink Pro 3.x on my MacBook Pro, but nothing seems to help. Any suggestions? I don’t see how all the same damn information works fine for my iPad Pro but fails for my iPhone and MacBook Pro. That’s just nuts.

How do I make sync happen in DTTG?
2

Nothing has changed on our side of things.
What kind of NAS?

3

Have you granted access to DEVONthink and DEVONthink ToGo to use the network in the device’s (not DEVONthink’s) “Privacy and Security” settings?

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4

First, thank you to the folks who tried to help. In answer to your questions, I have a Synology NAS, and yes, I granted those permissions. I just figured out the problem, and it’s nothing I expected.

Don’t ask me how, given that I didn’t change any settings, but somehow there were multiple failed login attempts by my various DEVONthink clients. As a result, my Synology NAS blocked the IP address of the house I’m in. My iPad Pro kept working only because I didn’t realize it was on its cellular connection. But as soon as I figured that out and unblocked the IP address here, everything started working again. Weird.

Maybe I briefly had an intermittent Wi-Fi connection or something that was garbling transmission? I don’t know how to explain that otherwise.

5

Good that it works again. Next time you have WebDAV trouble, an in-depth description of your network would be helpful, like IP addresses, co you connect in your local network or externally (via a DynDNS), can you connect in the finder etc.

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6

This is not the first incident we’ve seen recently. Another user here had a QNAP firmware update and when he checked, he also had blocked IP addresses.
If this is a new setup, verifying the URL is the first step. If it’s an existing one that suddenly fails, firewall and network monitors are a good place to start.

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