Internal Server Error when importing or previewing transactions in the UI

In the default configuration for the WebSphere HTTP Server plugin there is a ServerIOTimeout setting which by default is set to 60 seconds. If a dialog box is performing an operation and there is no user activity for this time, the error is thrown and the page must be refreshed.

It is worth noting that this does not effect the transaction being successfully processed by the application.

To resolve the problem you should open the WebSphere Administration Console.

Go to Sever Types, WebSphere Application Servers, MXServer (or whatever you server is called), Web Server Plug-in properties, change the Read/Write Timeout in seconds.

You can set this higher or you can set this to 0 to disable the time-out

Then generate and propagate a new plugin configuration.

Alternatively locate the plugin-config.xml file in the following directory where your HTTP Server is installed:

<HTTP_Server_Root>\plugins\config\webserver1\

In this file you will find the following section:

<ServerCluster CloneSeparatorChange="false" GetDWLMTable="false" IgnoreAffinityRequests="true" LoadBalance="Round Robin" Name="MXServer_ctgNode01_Cluster" PostBufferSize="64" PostSizeLimit="-1" RemoveSpecialHeaders="true" RetryInterval="60">
<Server ConnectTimeout="5" ExtendedHandshake="false" MaxConnections="-1" Name="ctgNode01_MXServer" ServerIOTimeout="60" WaitForContinue="false">
<Transport Hostname="max75w2k8.local" Port="9080" Protocol="http"/>
<Transport Hostname="max75w2k8.local" Port="9443" Protocol="https">
<Property Name="keyring" Value="C:\IBM\HTTPServer\Plugins/config/webserver1/plugin-key.kdb"/>
<Property Name="stashfile" Value="C:\IBM\HTTPServer\Plugins/config/webserver1/plugin-key.sth"/>
</Transport>
</Server>
</ServerCluster>

Notice the ServerIOTimeout setting in bold.

You can set this higher or you can set this to 0 to disable the time-out. However the Generate and Propagate process from the Admin Console above would wipe this change out.