Cisco Network Assistant 6.3 (4) java.lang.NullPointerException

[xiongguoy]

Cisco Network Assistant 6.3 (4)
Cisco WS-C2960X-24PSQ-L 15.2(7)E3

When trying to configure port settings:
ERROR: C2960X the CommandSet feature feature failed for this device
java.lang.NullPointerException

Application log and screen shot attached.

[pieterh]

org.apache.commons.httpclient.NoHttpResponseException: The server 10.1.1.3 failed to respond

=> did you enable http/https access to the device? 

[xiongguoy]

It happens regardless whether I connect via http or https.

Everything else is ok, only when try to configure port settings.

[pieterh]

you did not understand my question: => did you enable http/https access to the device?  

The server 10.1.1.3 failed to respond

suggests 10.1.1.3 is not reachable for http(s) requests! 
so the question is does the switch-config contains HTTP/HTTPS enable command? (not within CNA)
if in doubt attach the running-config of the switch to this post, the i can check.

[xiongguoy]

If http(s) isn't running, wouldn't I won't be able to connect at all?

I can connect and view/configure everything else except ports.