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I just got this error when trying to install my new Synology DS920+ on my local network:

An error occurred during installation. The telnet service of Synology NAS is turned on for error determination. Please configure your router to forward port 23 to Synology NAS, and then contact Synology online support.

How do I configure my (AT&T) router to allow for forwarding port 23 to Synology NAS? I don't know anything about how to use my router other than I have managed to get internet through it, so be gentle.

There is also an option to install the DS920+ software manually, maybe I can do that instead.

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    that does not sound safe. Contact support first, to see if they really want you to do this, and can explain why they want you to.
    – Frank Thomas
    Commented Aug 23, 2021 at 18:38
  • Can you explain why it's not safe so I know?
    – Lance
    Commented Aug 23, 2021 at 18:47
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    Telnet isn't a secure service, so in the modern era, its not generally used outside the LAN environment. instead secure protocols like SSH which support strong encryption and authentication schemes are typically used for exposing shell access over the WAN. By Forwarding the port, you are allowing anyone in the world to connect to your NAS over telnet. There are people out there that scan the whole internet looking for open ports to common services like telnet. I'd guess you'd have only minutes before someone noticed you had opened that port.
    – Frank Thomas
    Commented Aug 23, 2021 at 19:03
  • Why would synology be asking for this, I thought they were a respectable brand...
    – Lance
    Commented Aug 23, 2021 at 19:20
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    I wonder if you got a refurb or used device? If there isn't a disk in the first slot, make sure you populate it, but other than that, it does seem like somthing is wrong with that unit. Try getting it replaced, and see if you have problems with the new one. may be a lemon.
    – Frank Thomas
    Commented Aug 25, 2021 at 18:05

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It was because I got a hard drive that was not on the supported hard drive list. I returned what I got and got one from the list and it works!

Amazon recommended a specific drive next to the product, so I got that... Didn't work! Lesson learned.

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