Event ID 1008: "Maximum Request Length
Exceeded"
This is due to the Max
Request Length setting being 10MB by
default. So any message with an attachment that is around 8MB or so
will fail to send as the request is too big. The reason I say 8MB is that
we have to take into consideration the 33% MIME conversion bloat added to the
message after MIME conversion. Once that 33% is taken into account, we
will exceed the 10MB Max Request Length limitation. The iPhone will
continue to try and send the message until it is removed from the device.
To resolve this
issue with iOS devices, we typically recommend increasing the Maximum
Request Length parameter on the web.config file for ActiveSync on the
Client Access Server(s).
- On the CAS servers, browse to the web.config file (under the ClientAccess\Sync folder)
- Open the web.config file
- Modify the <httpRuntime maxRequestLength=”10240″/> parameter to a higher value to something higher, such as 15360 (15MB).
- Save the updated web.config file
- Restart IIS (IISRESET)
That's it.
Naturally if a larger value is needed then just follow the same steps to
increase the value that is required. We don't recommend getting too
carried away with this setting. Common recommendations are 15-20MB... and usually no higher than 50MB.
