vCenter is running 7.0 U2 receiving error in Update Planner "Unexpected error occurred while fetching the updates"

Products

• VMware vCenter Server

Issue/Introduction

• vCenter is running  7.0 U2 receiving error in Update Planner "Unexpected error occurred while fetching the updates"
• Log lines similar to the below are encountered in //var/log/vmware/sso/vmware-identity-sts log
<timestamp> INFO sts[78:tomcat-http--42] [CorId=96171d23-###-####-####-#######] [com.vmware.identity.sts.ws.SOAPFaultHandler] Returning a SOAP Fault with code: ns0:FailedCheck and description: Signature is invalid.
• Also referenced in the VMware vLCM (vSphere Lifecycle Manager) logs located in /var/log/vmware/vlcm/twisted_server.log
<timestamp> error vlcm Exchange failed with: ns0:FailedCheck: Signature is invalid.
<timestamp> error vlcm H5 SAML Response Code Expected 204, but got 502
<timestamp> error vlcm [opID=vapi] Authentication failed.
<timestamp>error vlcm [opID=vapi] Unable to authenticate user
<timestamp>error vlcm [opID=vapi] Security Context missing in the request
  
  

Cause

 vSphere Lifecycle Manager failing to authenticate due to a failed signature validation when attempting to get a new token.

Resolution

Workaround 

• SSH into the VCSA and restart the vSphere-ui service , Note that this is a temporary fix
  service-control --restart vsphere-ui
• This issue is resolved in VMware vSphere vCenter 7.0 U3 and later . See Download Broadcom Products and software