Hi
The vSphere Web Access do you mean http://<vcenter_server_ip>/ui ?
vSphere Web Access is available on vSphere 4 but I can't find any documentation that states that vSphere Web Access is still available in vSphere 5.5
You can use vSphere Client or vSphere Web Client to manage your vCenters, hosts, and VMs
Bayu Wibowo | VCIX6-DCV/NV
Author of VMware NSX Cookbook http://bit.ly/NSXCookbook
https://github.com/bayupw/PowerNSX-Scripts
https://nz.linkedin.com/in/bayupw | twitter @bayupw