How To Troubleshoot Error "Cannot Add Duplicate Collection Entry Of Type 'Add' With Unique Key Attribute 'Verb' Set To 'GET' "?

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How to troubleshoot error "Cannot Add Duplicate Collection Entry Of Type 'Add' With Unique Key Attribute 'Verb' Set To 'GET' " ?

Issue Description: When trying to launch Orchestrator website, it throws an error "Cannot add duplicate collection entry of type ‘add’ with unique key attribute ‘verb’ set to ‘GET’ " .


Error Screenshot:



Root Cause: Usually, this issue occurs if any website [Orchestrator] is created in the IIS and one of parent folders or application contains another filtering rules with same verbs as of the newly installed application.


Steps to Replicate:
  • Try to browse the Orchestrator website, it should throw the same error in browser
OR
  • Select and double click on UiPath Orchestrator website in IIS
  • Double click on Request Filtering option in the mid panel.


Resolution: :
  1. Open IIS Manager and select the Machine name in left panel
  2. Double click on Request Filtering in Mid panel
  3. Select HTTP Verbs, which will list out all the verbs having duplicates and causing the conflict with orchestrator website
  4. Remove all the duplicate verbs
  5. Try launching the Orchestrator website.