I cannot make command wget work behind a router. Here are my situation and network settings.

Ubuntu 14.04.

In organization A's network, I have a router (R) which connects a few servers (X, Y, Z), and R resides in A's network. R has IP like X has IP like under R with portal 2210. In other words, is X's IP assigned by R whose IP assigned by A is Basically R is the router of a subnetwork within A. I usually VPN to A, then get to X via a router with the following command, just to give you an idea of this:

ssh -p 2210 myUsername@

After I'm prompted with a password entry, I'm on X and need use wget to download something such as:

wget https://www.gnu.org/software/wget/

# output below:

--2019-05-15 01:02:03-- https://www.gnu.org/software/wget/
Resolving ftp.gnu.org ... failed: Temporary failure in name resolution
wget: unable to resolve host address 'ftp.gnu.org'

The file of /etc/network/interfaces looks like this:

  source /etc/network/interfaces.d/* # there's no file in this .d folder
  # The loopback network interface
  auto lo
  iface lo inet loopback
  # The primary network interface
  auto eno1
  iface eno1 inet static
  address # I used X's ip under router
  gateway # I used the router's ip

As suggested, I checked

  nslookup www.gnu.org

and got

  server can't find www.gnu.org.xxx.com: REFUSED

where xxx is my company's name, which I'm not sure where comes from (rounter?)

A is usually very strict on network security settings. I'm not sure if this is due to A's setting or due to my Ubuntu settings.

How can I solve this issue?

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put on hold as off-topic by Kulfy, vidarlo, Thomas Ward May 15 at 17:50

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  • Draw a diagram. You may for instance use Draw.io. I have a hard time following your descriptions. – vidarlo May 15 at 17:40
  • Note that 14.04 is beyond our support, now, and can only be supported by Canonical via an ESM subscription. Note also that the core problem here is DNS related, your system isn't able to make DNS requests outbound. – Thomas Ward May 15 at 17:51
  • which site should I ask for help? Thanks! – Tony Xu May 15 at 17:55
  • Wouldn't matter, becuase this sounds like A's problem. Your DNS server is iset to, which I bet is blocked on the company's network. (It's coming from the search domain setting which is probably still embedded in your resolv.conf). You need to talk to your network admins for assistance here, it's the settings on Org. A's network. They will instruct you in the proper network settings to use so DNS and such work – Thomas Ward May 15 at 17:58

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