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Support Article

Unable to merge documents using Silverlight



User is facing issue while merging the documents using Silverlight in their application.
User is using
Transport Layer Security (TLS) 1.2 on Pega 7.2.1, Product Composer System (PCS) 7.21 , WebSphere and Java 8.

When user clicks 'Create Word Merge', Out-of-the-box (OOTB) button, gets the a pop up to download the latest silverlight version and also the below error:
"Failed to re-attach server session. - 2147012867, A connection with the server could not be established."

The same works correctly when user uses TLS 1.0.


User closed all Internet Explorer browsers and uninstalled Silverlight prerequisites Then installed it again but issue is still replicable.

Error Messages

"Failed to re-attach server session. - 2147012867, A connection with the server could not be established."

Steps to Reproduce

1. Open Designer Studio.
2. Open the flow "Create Word Merge".
3. Run the flow.

Root Cause

A defect or configuration issue in the operating environment.


Perform the following local-change:

Step1: Download the following tool and install it on client machine from the below location.

Step2: If the issue still persists then change the below registry value from the below path:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Client

Step3:Change the DWORD value to 0 for disable the protocol.

Published February 13, 2017 - Updated October 8, 2020

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