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A set of recent patches have simplified management of backend connection attached to sessions. The API is now stricter to prevent any misuse. One of this change is the addition of a BUG_ON() in session_add_conn(), which ensures that a connection is not attached to a session if its <owner> field points to another entry. On older haproxy releases, this assertion could not be enforced due to NTLM as a connection is turned as private during its transfer. When using a true multiplexed protocol on the backend side, the connection could be assigned in turn to several sessions. However, NTLM is now only applied for HTTP/1.1 as it does not make sense if the connection is already shared. To better clarify this situation, extend the comment on BUG_ON() inside session_add_conn().