Wondering if this issue got resolved as I am having this same problem in which I am unable to communicate with my 3300 via data network. I am able to ping phones within the same subnet, but not my 3300.
Also, what would be the effects of changing ip address of the L2 Switch back to 0.0.0.0 (if able to)?
Would that prevent me from connecting a laptop to the secondary port to administer the device?
Side Note: someone mentioned above that it could be a Spanning Tree issue, RSTP is disabled on my system.