Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 817

Troubleshooting SSH To troubleshoot SSH, use the following information. You may not bind id_rsa.pub to RSA authentication while logged in via the console. In this case, this message displays:%Error: No username set for this term. Enable host-based authentication on the server (Dell EMC Networking system) and the client (Unix machine). The following message appears if you attempt to log in via SSH and host-based is disabled on the client. In this case, verify that host-based authentication is set to "Yes" in the file ssh_config (root permission is required to edit this file): permission denied (host based). If the IP address in the RSA key does not match the IP address from which you attempt to log in, the following message appears. In this case, verify that the name and IP address of the client is contained in the file /etc/hosts: RSA Authentication Error. Telnet To use Telnet with SSH, first enable SSH, as previously described. By default, the Telnet daemon is enabled. If you want to disable the Telnet daemon, use the following command, or disable Telnet in the startup config. To enable or disable the Telnet daemon, use the [no] ip telnet server enable command. The Telnet server or client is VRF-aware. You can enable a Telnet server or client to listen to a specific VRF by using the vrf vrfinstance-name parameter in the telnet command. This capability enables a Telent server or client to look up the correct routing table and establish a connection. Example of Using Telnet for Remote Login DellEMC(conf)#ip telnet server enable DellEMC(conf)#no ip telnet server enable VTY Line and Access-Class Configuration Various methods are available to restrict VTY access in . These depend on which authentication scheme you use - line, local, or remote. Table 83. VTY Access Authentication Method Line Local TACACS+ RADIUS VTY access-class support? YES NO YES YES Username access-class support? NO YES NO NO provides several ways to configure access classes for VTY lines, including: • VTY Line Local Authentication and Authorization • VTY Line Remote Authentication and Authorization Remote authorization support? NO NO YES (with version 5.2.1.0 and later) YES (with version 6.1.1.0 and later) VTY Line Local Authentication and Authorization retrieves the access class from the local database. To use this feature: Security 817