SNMP configuration issue

Hey guys-

     I have applied SNMP configuration on 2 VMware ESXi 4.1u3 Hosts in my environment, the following is the output from the show command:

Current SNMP agent settings:

Enabled:  1

UDP port:  162

Communities:  public

Notification targets:  192.168.1271@162/public

When I verify the applied SNMP configurations by testing a trap via VMA, I get the successful expected result.  However, when I verify the SNMP configurations to test a GET request via VMA, I receive the following output:

Timeout:  No Response from SERVER

This is the configuration that I am applying:

snmpwalk –v 2c –c s3c4t ESXI01.blah.com

Any input on what could be causing this or what to check for?