ClientReadReaquest: FD xxx Invalid Request

Having read the FAQ and the archive email i still cant figure out, where

these messages come from.
May be some one could help a beginner.
Thank you
Harald Wolfger

2000/03/04 10:38:56| clientReadRequest: FD 85 Invalid Request
2000/03/04 10:38:58| clientReadRequest: FD 103 Invalid Request
2000/03/04 10:38:59| clientReadRequest: FD 121 Invalid Request
2000/03/04 10:39:11| clientReadRequest: FD 130 Invalid Request
2000/03/04 10:39:11| clientReadRequest: FD 131 Invalid Request
2000/03/04 10:39:19| clientReadRequest: FD 127 Invalid Request
2000/03/04 10:39:54| clientReadRequest: FD 89 Invalid Request
2000/03/04 10:40:19| clientReadRequest: FD 53 Invalid Request
2000/03/04 10:40:54| clientReadRequest: FD 140 Invalid Request
2000/03/04 10:41:19| clientReadRequest: FD 79 Invalid Request
Received on Sat Mar 04 2000 - 12:14:49 MST