Dear friend!
Usually, you need to do the following three things:
1. Disabling DCC at Unused Optical Ports

2. Disable the NMS port on the non-gateway NE.

3. Changing the Password of the Default NE User
At present, the default users of network elements are as follows:
Username: szhw; password: Changeme_123
Username: root; password: Changeme_123
Username: lct; password: Changeme_123
Username: LCD; password: Changeme_123
Their default passwords need to be changed.

Thank you!