unable to communicate through cisco 2960 switch

[bijay.swain]

Hi
One cisco 2960 24 port switch is connected in our network . Hosts connected to this switch are able to ping/communicate to switch vlan 1 ip address. but hosts are not able to ping/communicate with each other .
Switch has only one vlan that is default vlan. all hosts and switch are in one subnet .
Switch is able to receive CDP messages from other connected switches but no hosts are able to communicate to the hosts connected to this switch.
I upgraded to new IOS .deleted vlan.dat and config.text file and recreated it but issue remains.

when the switch was working fine there were some memory error showing in console messages but once rebooted there is no error but this issue started.

[kamleshku]

I am facing the similar issue and did all the testing but no success. We are getting below message on console and found there is a bug (CSCuu00752)  in switch .  Hence we are going to replace the same  we did the power cycle work around provide in this bug  but issue is still same.

%ILET-1-DEVICE_AUTHENTICATION_FAIL: The FlexStack Module inserted in this switch may not have been manufactured by Cisco or with Cisco's authorization. If your use of this product is the cause of a support issue, Cisco may deny operation of the product, support under your warranty or under a Cisco technical support program such as Smartnet. Please contact Cisco's Technical Assistance Center for more information.