One of the clients gave the error but tcp/ip connection is ok.wha t else?

[PINNI, BALANAND (SBCSI)]

09/25/2001 10:04:10 TcpFlush: Error 9 sending data on Tcp/Ip socket
4294967295.
09/25/2001 10:04:10 sessSendVerb: Error sending Verb, rc: -50
09/25/2001 10:04:10 cuFSQry: Received rc: -50 from cuBeginTxn
09/25/2001 10:04:10 fsCheckAdd: received error from server query
:
Today I got error on one of AIX clients what could be?Causing TCP/IP FTP IS
OK.