Oracle-7.3.2.3.0 on Solaris2.6/x86, listener error

Hi Oracle community !

The goal of my effort is to get Oracle-7.3.2.3.0 running on a Solaris2.6/x86 with "Maintenance Update 1". I don't manage to get the SQL*Net V2 listener for TCP running.
The listener.ora:

#########
#
# Listener name = TCP_LISTENER
# Created Mon Jun 15 14:55:04 MET DST 1998
# by root
# 
#########


TCP_LISTENER=
	(ADDRESS_LIST=
		(ADDRESS = 


			(PROTOCOL = TCP)


			(HOST = trace) 


			(PORT = 1521) 


		)
	)


SID_LIST_TCP_LISTENER = 
	(SID_LIST = 
		(SID_DESC = 


			(SID_NAME = ORCL)


			(ORACLE_HOME = /usr/local/oracle7)


		)
	)

 

STARTUP_WAIT_TIME_TCP_LISTENER=0
CONNECT_TIMEOUT_TCP_LISTENER=10
#TRACE_LEVEL_TCP_LISTENER=ADMIN
TRACE_DIRECTORY_TCP_LISTENER=/usr/local/oracle7/network/trace TRACE_FILE_TCP_LISTENER=TCP_LISTENER
LOG_DIRECTORY_TCP_LISTENER=/usr/local/oracle7/network/log LOG_FILE_TCP_LISTENER=TCP_LISTENER When doing 'lsnrctl start tcp_listener' I get the following error message:

TNS-12538: TNS: no such protocol adapter

The tnslsnr already has parsed the listener.ora and stated the correctness of its parameters. So where the heck has that protocol adaptor gone ? I don't succeed when changing 'TCP' to 'tcp' - and I know that we ran an older release of Oracle on Solaris2.4/x86 for long time - with an identical configuration.
I'm also pretty shure that the TCP protocol for SQL*Net V2 _is_ installed - I even tried a fresh install of the whole Oracle server.

So _please_ anyone help me - I _have_ to get that going and I dont't know where to look for further information on that,

Martin.
--

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