They aren't compatible with some Linksys cards, but I believe the preferred replacement card is 3Com. http://www.elitetrader.com/vb/showthread.php?s=&postid=58399&highlight=linksys+and+IB#post58399
I am using the 3com network card already . I never had a problem with TWS alone. Only if I am running qcharts and TWS together at the same time . The problems I described above are caused by qcharts . (qcharts crashes and changes my stock lists ) THX for the answers unfortunally they do not solve my problem