Dns_probe_finished_nxdomain

Install, Configure and Update
1

Dear All,

I am sorry for bringing up this question. I usually run the CryoSpark job remotely from my Mac computer in my office using http://r16763.ttuhsc.edu:39000, and the working station on Rocky is in a separate room. This link failed to connect to CryoSpark two weeks ago, while it worked normally on Rocky. There is no internet connection issue with either the Mac or Rocky computers, and the domain and server ID are also correct. Our IT team couldn’t find any incorrect settings.

I have encountered this issue many times, and it was usually resolved by restarting one or both computers. However, this time, it does not work. Any suggestions would be greatly appreciated.

Regards,

Lan

2

@Lan Please can you let us know

  1. whether, from your Mac, you can connect to the workstation using ssh (replace username as applicable)
    ssh username@r16763.ttuhsc.edu
  2. the output of this command on your Mac
    curl r16763.ttuhsc.edu:39000
3

Hi Wtempel:

Thanks for your suggestions. Here is the output. Any other suggestions? Lan

ssh: Could not resolve hostname r16763.ttuhsc.edu: nodename nor servname provided, or not known

lguan @ LUBPHY-H100636 : ~ $ curl r16763.ttuhsc.edu:39000

curl: (6) Could not resolve host: r16763.ttuhsc.edu

4

What are the outputs of these commands

  • on the rocky workstation
    ip -4 -br a
hostname -f
host $(hostname -f)
cat /etc/hosts
  • on the Mac
    ifconfig -f inet:cidr | grep 'inet '
5 
base) \[cryosparc_user@r16763 \~\]$ ip -4 -br a

lo               UNKNOWN        127.0.0.1/8 

eno1             UP             69.175.144.241/24 

virbr0           DOWN           192.168.122.1/24 

(base) \[cryosparc_user@r16763 \~\]$ hostname -f

r16763

(base) \[cryosparc_user@r16763 \~\]$ host $(hostname -f)

Host r16763 not found: 3(NXDOMAIN)

(base) \[cryosparc_user@r16763 \~\]$ cat /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

(base) \[cryosparc_user@r16763 \~\]$ 

**lguan @ LUBPHY-H100636** : **\~** $ ifconfig -f inet:cidr | grep 'inet '

inet 127.0.0.1/8

inet 66.230.10.155/25 broadcast 66.230.10.255
6

Thanks @Lan Can you connect to CryoSPARC from your Mac’s browser using the
http://69.175.144.241:39000 url?

7

Hi Wte:
:)). YEEES

This is an exciting moment!

:grinning_face_with_smiling_eyes:

8

Glad to see this worked for now. Depending on how ip addresses are assigned on your network, this may not be a “permanent” solution. You may want to ask your IT support to configure the network and the workstation that the workstation will be assigned a stable FQDN that

  • persists between workstation reboots
  • can be resolved by other computers on the network

After that, you should be accessing the workstation and CryoSPARC using the “stable” FQDN instead of using an IP address.