Re: Cannot access a database - TNS 12547 lost contact

Hi, Roberto:

This error means that the administrator has put the machine 141.29.240.142 on the list of machines which are not to be allowed to connect to Oracle. Ask your administrator to take the machine off the list. It's kept in protocol.ora.

As to what "nntvlser" is, it's the name of the function in the Net8 code that detected the error.

                                                Rick

rcampo_at_libero.it (Roberto Campo) writes:

> 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

-- 
                                Rick Wessman
                                Security Assurance Group
                                Oracle Corporation
                                Rick.Wessman_at_oracle.com

     The opinions expressed above are mine and do not necessarily reflect
                         those of Oracle Corporation.