This problem may occur on systems using the Microsoft ISA server.

Oracle 9i listens on ports 8080 (HTTP) and 2100 (FTP) for valid WebDAV commands. To disable these ports, run the following commands while connected to the database as the SYS user:

call dbms_xdb.cfg_update(updateXML(
dbms_xdb.cfg_get()
,'/xdbconfig/sysconfig/protocolconfig/httpconfig/http-port/text()'
,0))
/

call dbms_xdb.cfg_update(updateXML(
dbms_xdb.cfg_get()
,'/xdbconfig/sysconfig/protocolconfig/ftpconfig/ftp-port/text()'
,0))
/

commit
/

exec dbms_xdb.cfg_refresh
/

This should disable XML DB on the Oracle instance.