title: Cloud functions - Host instance 'xxxxxxxxxxxxx' failed to acquire host lock lease: Azure.Storage.Blobs
body: <p>I have a function app attached to a storage account with 3 functions with timer triggers that randomly stopped working since last month.</p>
  <p>Any pointers to troubleshoot?</p>
  <p>Log stream pasted below</p>
  <blockquote>
  <p>2022-06-09T03:19:21Z [Information] Retrying to start listener for
  function 'Functions.MonthlyTriggerTotal' (Attempt 18)
  2022-06-09T03:19:21Z [Information] Retrying to start listener for
  function 'Functions.TimerTrigger1' (Attempt 18) 2022-06-09T03:19:21Z
  [Information] Retrying to start listener for function
  'Functions.RecurringExpensesTrigger' (Attempt 18) 2022-06-09T03:19:21Z
  [Verbose] Host instance 'xxxx-xxx-xxxxxxxxx' failed to acquire host
  lock lease: Azure.Storage.Blobs: Server failed to authenticate the
  request. Make sure the value of Authorization header is formed
  correctly including the signature.
  RequestId:d859920b-901e-0035-40af-7b9e9a000000
  Time:2022-06-09T03:19:21.2193397Z Status: 403 (Server failed to
  authenticate the request. Make sure the value of Authorization header
  is formed correctly including the signature.) ErrorCode:
  AuthenticationFailed</p>
  <p>Additional Information: AuthenticationErrorDetail: The MAC signature
  found in the HTTP request 'xxx-xxxx-xxx-xxxx' is not the same as any
  computed signature. Server used following string to sign: 'PUT</p>
  </blockquote>