Cannot access a database - TNS 12547 lost contact

From: Roberto Campo <rcampo_at_libero.it>
Date: 6 Mar 2002 03:02:04 -0800
Message-ID: <70103998.0203060302.7e291fb7@posting.google.com>

Hi everybody,
I'm trying to access a database server and I get the error TNS 12547 as soon as I try a tnsping to the machine. I activated the trace on the listener side and I get this kind of messages:

[...]

nttcnr: waiting to accept a connection.

nttvlser: entry
nttvlser: valid node check on incoming node 141.29.240.142
nttvlser: Denied Entry: 141.29.240.142

nttcon: exit
nserror: nsres: id=0, op=65, ns=12546, ns2=12560; nt[0]=516, nt[1]=0, nt[2]=0
nsopen: unable to open transport
[...]

May anyone tell me what "nttvlser" is and which kind of check is doing on my IP address?
RDBMS is ORACLE 8.0.5.2.1, OS is Windows NT 4.0 Thank you,
roberto Received on Wed Mar 06 2002 - 05:02:04 CST