Troubleshooting Junos PyEZ Connection Errors
Problem
Description:
When using Junos PyEZ to manage devices running Junos OS, the code generates an error that the connection was refused. For example:
jnpr.junos.exception.ConnectRefusedError
Cause
NETCONF is not enabled on the device or the number of connections exceeds the limit.
The most likely cause for a refused connection error is that NETCONF over SSH is not enabled on the device running Junos OS. To quickly test whether NETCONF is enabled, verify that the user account can successfully start a NETCONF session with the device.
[user@server]$ ssh user@R1.example.com -p
830 -s netconf
Solution
If NETCONF is not enabled on the device running Junos OS, enable NETCONF.
[edit]
user@R1# set system services netconf ssh
user@R1# commit
If the number of NETCONF sessions exceeds the limit, increase the maximum number of permitted sessions up to 250. The default is 75.
[edit]
user@R1# set system services netconf ssh connection-limit limit
user@R1# commit