Web Client goes into Off-line mode

Opening a folder within ExpressPro or just logging into the Inbox may result in an error from the web client that says it is going into off-line mode.

This can be caused when the amount of JSON data that the server has is greater than the maximum configured size of data we can send. To address this we can alter the web.config file for ExpressPro as follows.

• Open the folder where the ExpressPro web.config is e.g c:\Program Files\MailSite\WebServices\Web.UI
• Find the line that has this text within it without the quotes 'maxJsonLength'
• Then alter this line
• jsonSerialization maxJsonLength="100000"
• Here is an example of a possible value
• jsonSerialization maxJsonLength="10000000"

Once you save the file it will restart the application pool so this change will be live immediately.