API calls utilizing /appliance/vmon/service fail

Products

• VMware vCenter Server

Issue/Introduction

• 3rd party tools utilizing vCenter available vMON API's are failing. 
  
  
• When listing out the service registrations for the lookup service, the following entry is missing:
  
   Service Product: com.vmware.cis
        Service Type: cis.vmonapi
        Service ID: f9e758f0-6613-4f96-aebc-0d8d660265a6
        Site ID: default-first-site
        Node ID: ace2dffa-5862-4056-b2f5-e2a726b854af
        Owner ID: [email protected]
        Version: 1.0
        Endpoints:
                Type: com.vmware.appliance.vmon
                Protocol: vapi.json.http
                URL: http://localhost:1080/vmonapi
  
  
• In the vCenter - /var/log/vmware/vapi/endpoint/endpoint-access.log The following messages are present:
  
  20225:2025-05-14T20:56:41.771Z | jetty-default-1810496 | 10.60.130.41 - - [14/May/2025:20:56:41 +0000] "GET /rest/appliance/vmon/service HTTP/1.1" 404 325 "-" "Java/11.0.24" 0

Cause

Due to the above listed missing service registration, the API calls cannot complete correctly.

Resolution

Utilize LSDOCTOR and rebuild the service registrations for the vCenter experiencing the problem:

Using the 'lsdoctor' Tool

Additional Information

The API is deprecated and will be removed in a future version. More information can be found at the following KB:

Deprecation of vMON API service