Open Text Exceed (previously known as Hummingbird Exceed) is the only X-Server app qualified and supported for XPP Windows client connection to a LINUX XPP application server.
We are aware that some customers have had some success with other apps, including Xming. For anyone interested in looking into an application other than the supported Open Text Exceed, we recommend reaching out to the customer base through the XPP Community page and ask for their experience and suggestions.
https://community.rws.com/product-groups/contenta_publishing_suite/f