SQL Plus cannot connect (computers connected via DSL router)
Hi!
I have two computers connected locally via DSL router. One's IP is 192.168.1.64 and the other's IP is 192.168.1.65.
I try to connect to 192.168.1.64 via SQL plus from 192.168.1.66 by issuing the following command: sqlplus system@"192.168.1.64/orcl.168.1.100" and receive this error: "ORA-12170: TNS: Connect timeout occurred." I thought it was Windows default firewall that caused this and therefore changed windows' firewall settings in 192.168.1.64 by adding port 1521 into windows' firewall list. Now I receive this error: "ORA-12541: TNS:no listener."
Edited by: totalnewby on Jun 12, 2010 10:53 AM
totalnewby wrote:
Hi!
I have two computers connected locally via DSL router. One's IP is 192.168.1.64 and the other's IP is 192.168.1.65.
I try to connect to 192.168.1.64 via SQL plus from 192.168.1.66 by issuing the following command: sqlplus system@"192.168.1.64/orcl.168.1.100" and receive this error: "ORA-12170: TNS: Connect timeout occurred." I thought it was Windows default firewall that caused this and therefore changed windows' firewall settings in 192.168.1.64 by adding port 1521 into windows' firewall list. Now I receive this error: "ORA-12541: TNS:no listener."
Edited by: totalnewby on Jun 12, 2010 10:53 AM=================================
Assume you have the following in your tnsnames.ora:
larry =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = myhost)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = curley)
Now, when you issue a connect, say like this:
$> sqlplus scott/tiger@larry
tns will look in your tnsnames.ora for an entry called 'larry'. Next, tns sends a request to (PORT = 1521) on (HOST = myhost) using (PROTOCOL = TCP), asking for a connection to (SERVICE_NAME = curley).
Where is (HOST = myhost) on the network? When the request gets passed from tns to the next layer in the network stack, the name 'myhost' will get resolved to an IP address, either via a local 'hosts' file, via DNS, or possibly other less used mechanisms. You can also hard-code the ip address (HOST = 123.456.789.101) in the tnsnames.ora.
Next, the request arrives at port 1521 on myhost. Hopefully, there is a listener on myhost configured to listen on port 1521, and that listener knows about SERVICE_NAME = curley. If so, you'll be connected.
A couple of important points.
First, the listener is a server side only process. It's entire purpose in life is the receive requests for connections to databases and set up those connections. Once the connection is established, the listener is out of the picture. It creates the connection. It doesn't sustain the connection. One listener, running from one oracle home, listening on a single port, will serve multiple database instances of multiple versions running from multiple homes. It is an unnecessary complexity to try to have multiple listeners. That would be like the telephone company building a separate switchboard for each customer.
Second, the tnsnames.ora file is a client side issue. It's purpose is for address resolution - the tns equivalent of the 'hosts' file further down the network stack. The only reason it exists on a host machine is because that machine can also run client processes.
What can go wrong?
First, there may not be an entry for 'larry' in your tnsnames. In that case you get "ORA-12154: TNS:could not resolve the connect identifier specified" No need to go looking for a problem on the host, with the listener, etc. If you can't place a telephone call because you don't know the number (can't find your telephone directory (tnsnames.ora) or can't find the party you are looking for listed in it (no entry for larry)) you don't look for problems at the telephone switchboard.
Maybe the entry for larry was found, but myhost couldn't be resolved to an IP address (say there was no entry for myhost in the local hosts file). This will result in "ORA-12545: Connect failed because target host or object does not exist"
Maybe there was an entry for myserver in the local hosts file, but it specified a bad IP address. This will result in "ORA-12545: Connect failed because target host or object does not exist"
Maybe the IP was good, but there is no listener running: "ORA-12541: TNS:no listener"
Maybe the IP was good, there is a listener at myhost, but it is listening on a different port. "ORA-12560: TNS:protocol adapter error"
Maybe the IP was good, there is a listener at myhost, it is listening on the specified port, but doesn't know about SERVICE_NAME = curley. "ORA-12514: TNS:listener does not currently know of service requested in connect descriptor"
=====================================
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Alias LISTENER
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Start Date 27-APR-2010 09:35:08
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Copyright (c) 1997, 2007, Oracle. All rights reserved.
Used parameter files:
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Hi,
Just bought the HP6500a Plus and understand that this printer is having problem with the constant wireless connection. I am having the same problem and changing the IP address occasionally solve the problem but not alway and it also create problem which cannot access to webapps or ePrint because I change the IP address and also put 0.0.0.0 in the gateway address.
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Non-Domain joined clients connect to server initially but cannot connect via Launchpad
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Robert Pearman SBS MVP
itauthority.co.uk |
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