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Linda Caputo
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Fixed section of table
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docs/exchange-web-services/handling-notification-related-errors-in-ews-in-exchange.md

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|**ErrorExceededConnectionCount** |Open a connection to get events when the account reached its connection limit of open streaming connections. | <ul><li>Using [impersonation](http://technet.microsoft.com/en-us/library/dd776119%28v=exchg.150%29.aspx) to [open connections](how-to-maintain-affinity-between-a-group-of-subscriptions-and-the-mailbox-server.md#bk_throttling).</li><li>Using fewer connections to get events. Maximize the number of subscriptions in each connection by [using affinity](how-to-maintain-affinity-between-a-group-of-subscriptions-and-the-mailbox-server.md) and [placing a maximum of 200 subscription IDs in the same group](how-to-maintain-affinity-between-a-group-of-subscriptions-and-the-mailbox-server.md#bk_howdoimaintain). You can then use the same connection to retrieve events for the entire group, reducing the number of connections required.</li><li> Changing the value of the HangingConnectionLimit in the web.config file for Exchange on-premises to override the default value of three open connections. Exchange Online has a default HangingConnectionLimit of 10, which is not configurable.</li></ul> |
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|**ErrorExceededSubscriptionCount** |Create too many subscriptions. The [EwsMaxSubscriptions](http://msdn.microsoft.com/en-us/library/microsoft.exchange.data.directory.systemconfiguration.throttlingpolicy.ewsmaxsubscriptions%28v=exchg.150%29.aspx) throttling policy parameter determines the maximum number of subscriptions that an account can create. | <ul><li>Using [impersonation](http://technet.microsoft.com/en-us/library/dd776119%28v=exchg.150%29.aspx) to [create subscriptions](how-to-maintain-affinity-between-a-group-of-subscriptions-and-the-mailbox-server.md#bk_throttling).</li><li>Reducing the number of subscriptions.</li></ul> |
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|**ErrorInvalidSubscriptionRequest** |Create subscriptions for multiple mailboxes or multiple folders from a single request. |Creating a subscription for a single public folder or a single <ul><li>Checking the subscription ID returned in a previous response.</li><li>Ensuring that you're sending the subscription ID for the correct **ExchangeService** object.</li><li>[Creating a new subscription](handling-notification-related-errors-in-ews-in-exchange.md#bk_recover).</li></ul> |
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|**ErrorInvalidSubscriptionRequest** |Create subscriptions for multiple mailboxes or multiple folders from a single request. |Creating a subscription for a single public folder or a single mailbox in a single request.|
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|**ErrorInvalidWatermark** |Get events by using an invalid watermark.| <ul><li>Checking the subscription ID returned in a previous response.</li><li>Ensuring that you're sending the subscription ID for the correct **ExchangeService** object.</li><li>[Creating a new subscription](handling-notification-related-errors-in-ews-in-exchange.md#bk_recover).</li></ul> |
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|**ErrorMissedNotificationEvents** |Get events when some previous events were missed. |Comparing the extended folder properties **PR_LOCAL_COMMIT_TIME_MAX** (0x670a) and **PR_DELETED_COUNT_TOTAL** (0x670b) to determine what changes were missed, and [creating a new subscription](handling-notification-related-errors-in-ews-in-exchange.md#bk_recover). |
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|**ErrorProxyRequestNotAllowed** |Subscribe to events for a user in a batched request whose mailbox has moved to another site. |Using [Autodiscover](autodiscover-for-exchange.md) to rediscover the ExternalEwsUrl or EwsPartnerUrl, and creating a new subscription. |
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|**ErrorReadEventsFailed** |Get events from a subscription that cannot be found. |Using [Autodiscover](autodiscover-for-exchange.md) to rediscover the ExternalEwsUrl or EwsPartnerUrl, and creating a new subscription. |

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