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Internet connection suddenly lost

Posted: Sat Sep 21, 2019 1:28 pm
by Zaiman1906
Hey guys,

I have a TS-431P, which has 2 LAN-adapter (ports) at the backside. The NAS is connected with a LAN-cable on adapter 1 (the higher one) on the backside to a Fritz Box 7490. The Fritz Box in turn is connected by a another LAN-Cable to an Access Point AP-AC-LR from Ubiquiti (Unifi). This access point and two mesh devices (AC-AP-M) provides my WLAN.

Till around two weeks ago all works fine. But suddenly, I don't know why, the NAS lost internet connection. I took a look in "virtual adapters and switches" in QTS and saw, that on adapter 1 the connection is established, but no internet connection. So I switched the LAN-cable from adapter 1 to adapter 2 on the backside of the NAS. After the connection was established, I also got back internet connection! For an try, I took a second LAN-cable, put it in adapter 1 and connected it with the Fritz Box. I got connection, but again no internet connection.

I tried to reset my NAS, both methods (3- and 10-second-Reset), but the problem is still there. I contaced the support to ask, if the adapter 1 is defect? But they say it isn't. The lamps are blinking green and orange.

Though I have internet connection, I would like to know, what's the problem with adapter 1?

Re: Internet connection suddenly lost

Posted: Mon Sep 23, 2019 6:03 pm
by storageman
Sounds like an IP address issue.
What happens when NIC1 uses NIC2 IP address (obviously when NIC2 disconnected)?

Re: Internet connection suddenly lost

Posted: Mon Sep 23, 2019 7:37 pm
by Zaiman1906
I changed the IP adress from adapter 1 from xxx.xxx.xxx.45 to xxx.xxx.xxx.46 and to xxx.xxx.xxx.xxx.47, but that didn't solved the problem. Would it help to change these IP to xxx.xxx.xxx.173, which is the IP from adapter 2?

Re: Internet connection suddenly lost

Posted: Mon Sep 23, 2019 9:59 pm
by storageman
Zaiman1906 wrote:
Mon Sep 23, 2019 7:37 pm
I changed the IP adress from adapter 1 from xxx.xxx.xxx.45 to xxx.xxx.xxx.46 and to xxx.xxx.xxx.xxx.47, but that didn't solved the problem. Would it help to change these IP to xxx.xxx.xxx.173, which is the IP from adapter 2?
Well yes, that's what meant. Something weird here. If Qnap adamant not a hardware issue, has to be address issue.

Re: Internet connection suddenly lost

Posted: Tue Sep 24, 2019 7:36 pm
by Zaiman1906
I tried that, but it only worked for a few seconds. Now again I have no internet connection on adapter 1, but on adapter 2.

Re: Internet connection suddenly lost

Posted: Tue Sep 24, 2019 9:02 pm
by storageman
What does Putty "ifconfig" say?

Have you tried tracing how the connection gets out?
in Putty try
"traceroute google.com"

Re: Internet connection suddenly lost

Posted: Tue Sep 24, 2019 9:40 pm
by Zaiman1906
Surprisingly now I am getting internet connection on adapter 1. I found in the Fritz Box under >>internet >> filter >> children protection , that there were 6 entries for my NAS and one of was blocked. I changed this to standard. Maybe this was the problem. Why Fritz Box made this, I don't know, I didn't changed it by myself.

Thanks for the advice!!!

Re: Internet connection suddenly lost

Posted: Tue Sep 24, 2019 9:57 pm
by storageman
Great! You found it. Persistence pays off!