dialin-problem

hi, in the last days i've got warnings like Nov 2 14:58:15 server ipppd[1682]: demuxprotrej: Unrecognized Protocol-Reject for protocol 0x43 in my dialin-server-warn-log. since i'm reading this list i am a little bit nervous about those topics :-) does anybody know something about the warning and can tranquilize my mind ?! thanks and greets, daniel