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How to encrypt the network traffic between KCS TC/LINK-LN and IBM Domino Server

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To improve security, we want to encrypt the network traffic between KCS TC/LINK-LN and our Lotus Domino Servers. Is this somehow possible?


TC/LINK-LN uses the Lotus Notes C++ API to communicate to the Domino server. The Lotus Notes API handles encryption transparently for the client application (TC/LINK-LN in this case). That means, if you enable encryption on the Domino Server itself, the clients (and also TC/LINK-LN) will use the encryption automatically and no additional actions must be done on the client side.

See section “Network ports” within the following IBM Lotus Notes Administrator Online Help: OpenDocument

The following link describes the steps, which need to be done to enable encryption on the Dominio Server: OpenDocument

12068 2018-07-26_1030.pngEnabling the “Encryption” checkbox in the Domino server configuration document changes the following setting within the C:\Program Files\IBM\Lotus\Domino\notes.ini


After encryption is enabled on the Domino Server, the server must be restarted.


Level of Complexity 



Applies to  

Product Version Build Environment Hardware
KCS TC/LINK-LN all   Domino Server Version 8.5.3, verified by checking the network traffic with Wireshark before and after encryption was enabled.  


Keywords: TC/LINK-LN encrypt, Lotus Notes


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