|**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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