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OEM Database Control: change port numbers

Mon, 11/17/2014 - 21:22

Symptoms

Several port numbers are used internally by Oracle Enterprise Manager Database Control. You want to change them, for instance because they collide with reserved ports for other applications on the same server.

Solution

You can change the port numbers, provided you have command-line access on the database server as the user Oracle was installed with. This will cause no downtime on the database, though Enterprise Manager itself will need to be restarted.

OEM Database Control: change HTTP(S) listen port

Mon, 11/17/2014 - 20:54

Symptoms

The port number on which Oracle Enterprise Manager Database Control is listening for HTTP(S) connections is not what you want, especially if more than one database instance is present on your Oracle database server.

Solution

You can change the port number, provided you have command-line access on the database server as the user Oracle was installed with. This will cause no downtime on the database, though Enterprise Manager itself will need to be restarted.

Lenovo E145: Wireless network

Tue, 09/30/2014 - 23:45

Symptoms

The wireless network adapter on Lenovo E145 laptops is not supported out of the box on Debian. Though you can see the PCI device (using lspci), you do not have a wireless interface (as checked with ifconfig -a, for example).

OpenVPN: Routing content for your connection point

Fri, 07/11/2014 - 11:47

Symptoms

You use a VPN to connect your mobile device, for example your laptop, to your server. All traffic should go through this VPN, as you do not trust random networks you may connect to. This works fine, except when you try to connect to your server through its public IP address. As this is also the IP address that is used as the VPN end point, traffic to it does not go through the VPN but is routed, unencrypted, through the untrusted network.

Sendmail: Using TLS for authentication

Tue, 07/01/2014 - 11:15

Symptoms

You have a laptop or other mobile device running Debian. You have your own Sendmail server, also running Debian. You want to send email from your laptop, but your Sendmail server does not accept your emails if you are not on your local network.

Lenovo E145: Swap Function and Ctrl keys

Sat, 05/31/2014 - 13:26

Symptoms

The <Fn> key on this laptop is at the place most experienced keyboard users would expect the <Ctrl> key to be.

Solution

You can swap both keys around by a BIOS setting. This may be a bit confusing for others who want to use your computer, though. This also works properly in Linux.

Procedure

Enter the BIOS setup.

Lenovo E145: Function keys

Sat, 05/31/2014 - 13:21

Symptoms

Function keys do not seem to work properly. Perhaps they so very unexpected things. This may be very disconcerting if you interrupt normal startup by pressing <enter> and then are unable to select one of the menu options.

Solution

You have to press the <Fn>-button at the same time as the function key in order to use it as a function key.

You can switch this behaviour around by setting a BIOS option.

Procedure

Enter the BIOS setup.

Lenovo E145: Booting a foreign disk

Sat, 05/31/2014 - 13:13

Symptoms

When having replaced your internal laptop disk, already preloaded with Linux, you can not boot it; if you select it in the boot menu, nothing seems to happen and you return to the boot menu almost immediately.

Solution

We have to disable Secure Boot and enable Legacy Boot.

Procedure

Enter the BIOS setup (from the boot menu, you can under App Menu select Setup).

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by Dr. Radut