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DS220+ unable to connect to router, internet, QC, DDNS, Tailscale - only accessible locally

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5
1
NAS
DS220+
Operating system
  1. Windows
Mobile operating system
  1. iOS
I was messing about with AdGuard Home for a while and I think something may have been incorrectly changed, that I've been unable to figure out.

My NAS was always on external access only via TailScale (v1.62) until last week when I upgraded to v1.64.2 (which is supposed to have a Synology fix for being unable to reauthenticate). At the same time, I also removed AdGuard Home and related settings changes, since this was breaking too many websites for me, and Duplicacy didn't want to work well with it.

Thinking back, this was when my issues started. Tailscale disconnected (and haven't been able to reconnect since), and I started digging into why that was, which eventually led me down a dark rabbit hole when I discovered the NAS was simply inaccessible via any method:
  1. Tailscale - I first rolled back to 1.62.1 (previous working version) but that didn't work. Stuck at Reauthenticate screen. I also ssh-ed into NAS and tried to sudo tailscale up, but after entering my NAS password, it just blanks out. I've now completely uninstalled TailScale.
  2. Quick Connect - I had previously disabled this, but went in to enable and get the error " Domain name cant be resolved. Please change your DNS server address to 8.8.8.8 and try again". DNS on my router is automatic from my ISP (shifted back from AdGuard Home DNS when I removed AGH). NAS DNS was also set to automatic but I changed to manual (8.8.8.8 and 8.8.4.4) and restarted NAS - nothing. Set it back to automatic, went into network settings and checked to make sure ipv4 was auto-DHCP (it was), restarted NAS again and still - nothing.
  3. DDNS - This was also previously disabled, so I went in and tried to enable that, now get the error Synology login unable to authenticate and the test connection fails, with a popup asking me to contact Syno tech support. FYI: I'm able to login to my DSM account on the Synology website.
  4. Then I tried going into Regional Options and updating date/time with a sync to time.google, and that failed too
  5. SSH-ed into my NAS, sudo -i to root and tried to ping router on the local network 192.168.xx.xx and there was no response. At this point I figured the NAS is just not communicating with anything outside the local network. Like it's completely blocked off!
Some DNS check for authentication and external access (or for the NAS to work properly) is failing somewhere - but how do I figure out where? NAS is on a router assigned static IP, router has DHCP server enabled. NAS is also plugged in directly to the router I'm trying to ping.

I may be missing something here - and I definitely have not written down all the things I've tried since I also reset and restarted router, checked firewall settings and made sure nothing is blocked etc. Port shouldn't matter since I'm still on local network and I've never had to mess with that before (I don't open ports on router unless absolutely required, which is almost never).

What's weird to me is that I can still access the NAS locally from my laptop, so that means it is communicating with router? So how is it unable to ping the router?

I've hit the limits of my know-how and whatever troubleshooting Google can provide. So I'm here asking for help! I'm also going to contact tech support later today, but thought I'd ask here to see if anyone has any pointers. What am I missing?
 
TailScale is a VPN. It likely required a router port forward. Check to see if you have an improper router port forward setup.

After checking your router to see if there is an improper port forward, disable your NAS firewall. Then check NAS access to internet. If you have success with your NAS firewall disabled, you know to look more closely there.
 
Last edited:
TailScale is a VPN. It likely required a router port forward.
No port forward required. That is one beauty of Tailscale.
Tailscale - I first rolled back to 1.62.1
IAzAtMG.png

No issue here. DSM 6.2. Have you tried disabling your NAS firewall.
 
Last edited:
TailScale is a VPN. It likely required a router port forward. Check to see if you have an improper router port forward setup.

After checking your router to see if there is an improper port forward, disable your NAS firewall. Then check NAS access to internet. If you have success with your NAS firewall disabled, you know to look more closely there.
There's no port forwarding on the router for Tailscale. I double checked that again. I also disabled firewall and checked, but no dice. Still not working.
[automerge]1714235463[/automerge]
No port forward required. That is one beauty of Tailscale.

IAzAtMG.png

No issue here. DSM 6.2. Have you tried disabling your NAS firewall.
Yes, just now. No dice.
[automerge]1714236594[/automerge]
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View: https://imgur.com/a/WxVcbOn Screenshot of various settings and putty ping session.
 
Exact same issue as described here except that I have no network switches or VLAN
Any help in diagnosing?
 
OK, I got this to work by changing the reserved ip and reconnecting the ethernet cable to flush the DHCP lease and force reconnect the NAS to the gateway. After almost 6 days, I'm connected again!
 
I'm not sure how helpful this is but sometime ago I had difficulty authenticating Tailscale to the NAS. So my solution was to manually load various Tailscale versions going back in time, until I found one that authenticated. I stayed with that one for quite some time. And now authentication is no longer an issue for me. Before I upgraded to version 1.64 I was running version 1.60 without difficulty. Perhaps that one will do better for you in the short run.
 
Once I got the NAS up and running with internet connection again, I was able to reauthenticate Tailscale with v1.64.2!
 

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