The CPAN module Net::Socket::NonBlock has a port forwarding utility which works for both Unix and Windows: $ perl tcpudppf.pl Usage: tcpudppf.pl <LocalAdd...

On windows, display IPv4 routing table: route -4 print On Linux: $ route Kernel IP routing table Destination ... This works for both Linux and Windows (" -r ": display routing table, " -n ": display address and port numbers in numerical form): netstat -rn

Especially, the ethernet0.virtualDev = "e1000" line should be absent in order for networking to work. #!/usr/bin/vmplayer # Filename: Win2000.vmx...

If you don't want to open an extra port for VNC or want extra security with SSH, you can setup an SSH tunnel for VNC. On Windows, you can do this with Putty or openssh . Open a command window, and enter (using Putty as example): C:\local\bin\plink.exe -ssh -2 -L localhost:5901:r... When connecting with vncviewer , use localhost:5901 as server instead of remote_host:5901 . If you use the setup frequently, it is more convenient to setup the tunnel as a Windows service . Assuming the name of the service is vnc_tunnel , the registry entry would look like: Windows Registry Editor Version 5.00 [HKEY_...

I installed vncserver on my Fedora box and tried to connect to it with vncviewer from Windows XP. I got this error: What could be the problem? These were the steps I took to diagnose it. I just list them here as a reminder. Is Windows firewall blocking the connection? No. It turned out that, unlike ZoneAlarm , the Windows firewall does not block outgoing traffic. It only blocks incoming requests. Is vncserver listening on the right IP address? Yes. netstat showed it's listening on all NICs. netstat -a | grep 5901 tcp 0 0 *:59... Is VNC port open on the local Fedora box on that IP address? Yes, telnet successfully connected: [jim@fedora ~] telnet 172.30.33.9 5901 Trying 1... What does telnet say from...

This happens when you don't have connectivity to the Oracle server. This could be that the server is not up or you are blocked because of some firewall rules. A typical session looked like this: C:\>sqlplus scott/tiger@xe SQL*Plus: Releas... Use tnsping to confirm the cause: C:\>tnsping xe TNS Ping Utility for 32-bit ...

In sqlnet.ora , there's a parameter named NAMES.DEFAULT_DOMAIN that usually contains the value world . If you remove this parameter then you don't need to append .world . My sqlnet.ora contains three lines: # sqlnet.ora Network Configuration File: C:\wo... To force a lookup without NAMES.DEFAULT_DOMAIN appended, append a dot to the tnsname: tnsping unqualified_tnsname_name.

Use tnsping to test connectivity to Oracle DB (actually, the "listener process"): tnsping <net service name> [<count>] where the "net service name" must exist in the tnsnames.ora file, count is optional. Here's a sample output: C:\work\globaltnsnames>tnsping xe TNS Ping ...

Today I tried to start up Apache on my Windows XP box and was surprised to find that port 80 was already used by some other process! I used netstat to find the culprit: @rem the -a switch displays all connections an... The -b switch causes the command to run quite a bit longer. You can use -ano instead and then use the Task Manager or PsTools from sysinternals to find out the executable name. It turned out that Skype was using both port 80 and 443. I turned that off in Skype preferences.

The tnsnames.ora file maps net service names to connect descriptors. Here's a sample: ORA10 = (DESCRIPTION = (ADDRESS_LIST = ... When a client connects with a net service name, tnsnames.ora is searched in the following order: $HOME/.tnsnames.ora (or current working directory on Windows) $TNS_ADMIN/tnsnames.ora /etc/tnsnames.ora $ORACLE_HOME/network/admin/tnsnames.ora