Preview does not work in Media gallery after uploading an image

Users can not preview images that are uploaded to Media Gallery

Errors are displayed in the trace.log

PhotoRenditio W

com.ibm.lconn.media.renditions.PhotoRenditionEventHandler init

exception while generating photo renditions

org.apache.commons.httpclient.ProtocolException: Unbuffered entity

enclosing request can not be repeated.

at

org.apache.commons.httpclient.methods.EntityEnclosingMethod.writeRequest

Body(EntityEnclosingMethod.java:483)

at

org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpMethodBase

.java:1973)

[12/12/11 10:45:49:140 EST] 00000064 SubscriberMan E

com.ibm.lconn.events.internal.spi.async.SubscriberManager run

CLFWY0202E: The event handler named PhotoRenditionEventHandler threw an

exception when handling an event. Check nested exception for more

details.

This issue can occur when the default user is changed in the connectionsAdmin account.

Enable the event handler trace for Files preview generator:

com.ibm.lconn.media.renditions.*=all

1. Create a new Security Role for mediaGalleryAdmin by going to:

Security > Global security > Java Authentication and Authorization Service > JAAS - J2C authentication data.

Select New and set the alias to mediaGalleryAdmin, and add an admin user who can authenticate and exists in the Profiles database.

2. Then add the user from the mediaGallery j2c role, to the Security Role for admin in the Files Application.

3. Also replace the connectionsAdmin role with the newly created mediaGalleryAdmin role to the j2c property in the events-config.xml

<property name="j2calias">mediaGalleryAdmin</property>