Hi Everyone
We are experiencing inventory search issue with few of our vCenters, We are unable to search objects (VMs,Hosts,Datastors, etc) in the VMware inventory. Let me quickly give you the background and the troubleshooting steps that we have followed. Unfortunately, still we are unable to fix this issue and hope you can help and advise us to fix this issue.
We are managing large scale VMware environment and we are using separate vCenters for each and every sites to manage the VM environment. I would like to remind you that we are experiencing the same issue with all the vCenters. When we are using the vSphere Client. But search function is working fine with the Webclient. And all our environment is based on vSphere 5.5.
Once we search a VM or any other object in the inventory it throws the below error message

I did a google search and tried every possible answers and could not find any answer to fix this.
I found the below KB article and it was not able to give me what I expected and issue not resolved. Also changed the vCenter default time out settings.
Using the vSphere Client 5.5 to login, search, or sort the inventory fails with the error: Unable to connect to web serv…
Once We type the username and password manually without selecting the "Windows Authentication" we are getting the below error message , also we tried this with the vCenter Local account and gave the same error message.

I have escalated this to the VMware support and they mentioned that this is an error with the vCenter "Proxy XML" file and vCenter re-installation is required to fix this. As we are managing a large environment and lots of teams are using the vCenter we are not able to go for a re-build.
I really appreciate if you can assist me to find a solution for this search issue.