Description

While opening the solution user is getting an error "An Error occurred on the server - Maximum request length exceeded"

Applies to

Composer, Foundation, Central
10.X, 11.X

Solution

Go into IIS Manager and do the following:

Select the Winshuttle Composer site -> Double click Request Filtering under IIS
Click on Edit Feature Settings...
Update Maximum allowed content length (Bytes) to: 300000000

Open the Composer web.config file and search for the following:

Change the following key to this value <jsonSerialization maxJsonLength="2147483647" />
Change this key to this value  <requestLimits maxAllowedContentLength="500000000" />
CHange this key to this value  <httpRuntime targetFramework="4.5" requestValidationMode="2.0" maxRequestLength="2097151" executionTimeout="900"/>

Open the SharePoint web.config file  (C:\inetpub\wwwroot\wss\VirtualDirectories\<web app name> )and search for the following:
Change all instances of this key to this value  <httpRuntime maxRequestLength="2097151" executionTimeout="3600" />

Also change the settings https://blogs.technet.microsoft.com/sammykailini/2013/11/06/how-to-increase-the-maximum-upload-size-in-sharepoint-2013/

Once these have been changed, reload Composer and attempt to publish the form.