No license verification needed for the IP Client.  It authentictes using the customer's online support account.  Just to note to others, the link you mention is only for EMC support to verify ESRS licenses for the full version of ESRS 2.x and ESRS 3.x (VE).  For VNX systems, we would also recommend the embedded device clients instead of provisioning a new Windows server for IP Client.  All flavors of VNX have ESRS built-in now with the latest code levels.
Hi,  I am planning to install ESRS IP Client for VNX. I checked ESRS Site Verification by esrs.emc.com/esrs/provisioning/siteId/XXXXXXX/deviceType/ESRS-GW/siteVerification. And then, I got messaige of "<errorMessage>Site doesn't have a valid ESRS Part number in CSI errorMessage>".     I could not find any discription that says Site Verification is needed for ESRS IP Client for VNX as well as ESRS GW Client.   Do you know if Site Verification is needed or not in installing ESRS IP Client for VNX?
Do you know if Site Verification is needed or not in installing ESRS IP Client 
for VNX?