The following combinations do not support SNI:

Client side

    Internet Explorer (any version) on Windows XP
    Safari on Windows XP
    wget[22]as of 2011 has a patch available.
    BlackBerry Browser
    Windows Mobile up to 6.5[23]
    Android default browser on Android 2.x[24] (Fixed in Honeycomb for tablets, targeted for Ice Cream Sandwich for phones)

Server side

    IBM HTTP Server [25]

Libraries

    Qt client side up to 4.7[20]
    Mozilla NSS server side [26]
    Python 2.x (ssl, urllib[2] and httplib modules) [19]