Initial discovery worked fine. Recently added two cascaded devices. First device is discovered using CDP, but shows in the summary as "Unreachable" and only the IP address is listed. The second device is not discovered.
The SNMP credentials are correct in the switches (2950T) and in Discovery Settings, as well as Default Credentials.
I will be happy to send the appropriate logs if you can tell me which ones to enable, and which files you would like to see.