Exchange Server throttling policies
Microsoft Exchange Server uses client throttling policies to manage the performance of Exchange Server. These throttling policies govern the resources that each user consumes on Exchange Server, and enforces connection bandwidth limits, as defined and necessary.
Following are the general throttling policies.
|
Exchange Server area |
Parameter |
Default value |
|---|---|---|
|
Streaming notifications |
HangingConnectionLimit |
Exchange Online: 10 Exchange 2013: 3 |
|
Pull or push connections |
EWSMaxConcurrency |
Exchange Online: 27 Exchange 2013: 27 Exchange 2010: 10 |
|
Subscriptions |
EWSMaxSubscriptions |
Exchange Online: 20 Exchange 2013: 5000 |
When throttling polices exceeds, EWS generates errors as shown in the following table.
|
Error |
Throttling policy parameter |
Description |
|---|---|---|
|
ErrorExceededConnectionCount |
EWSMaxConcurrency |
Indicates that there are more concurrent requests against the server than the throttling policy allows. |
|
ErrorExceededSubscriptionCount |
EWSMaxSubscriptions |
Indicates that the maximum subscription count of a user's throttling policy is exceeded. |
Make sure that the throttling policy parameters of the Exchange Server are set in accordance with available hardware and network resources to avoid any errors.