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exchangewebservices
Kangee
Kangee

Reputation: 1

Exchange Webservices (EWS) UpdateItems error 503

if i try to update more than one appointment with the Service.UpdateItems methode the server returns an 503 error. My Code:

service.UpdateItems(appointments,folderID,ConflictResolutionMode.AutoResolve, null, SendInvitationsOrCancellationsMode.SendToNone);

Updating a single appointment with the Appointment.Update methode works.

Has anyone an idea why Service.UpdateItems does not work ?

Upvotes: 0

Views: 2579

Answers (1)

Jakub Kaleta
Jakub Kaleta

Reputation: 1780

You may be getting throttled by Exchange by trying to execute too many updates at once. Try smaller batches - of 10 items, or try spacing your requests with longer breaks between them.

As it is described here, there are three response codes which may indicate a throtting problem:

  • HTTP Status 503 Indicates that EWS requests are queuing with IIS. The client should delay sending additional requests until a later time.

  • HTTP Status 500 - Indicates an internal server error with the ErrorServerBusy error code. This indicates that the client should delay sending additional requests until a later time. The response may contain a back off hint called BackOffMilliseconds. If present, the value of BackOffMilliseconds should be used as the duration until the client resubmits a request.

  • HTTP Status 200 - Contains an EWS schema-based error response with an ErrorInternalServerError error code. An inner ErrorServerBusy error code may be present. This indicates that the client should delay sending additional requests until a later time.

Upvotes: 1

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