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Ask the ExpertHave questions about network security for expert Brad Casey? (All questions are anonymous)The problem of securing legacy systems will never go away; the speed with which technology changes is simply too difficult for most organizations to keep up with. In regard to serial port servers, while many associate these devices with printers, scanners, and the like, I think the average reader would be astounded at how prevalent the technology is within contemporary enterprise environments.The found that serial port technology is still being used to connect to fuel pumps, traffic lights and other critical infrastructure.

With regard to how an organization can protect existing serial ports, I would offer much of the same advice that Moore offered.Oftentimes, the access to these ports that Moore achieved was due to improper configuration. If you haven't already done so, conduct a and compile a list of all the legacy systems that may have insecure serial ports and related devices. Contact the device or software vendors to ensure you not only have the latest software or firmware installed, but that you also have the devices configured according to their best practices. Assuming your vendors aren't much help, there are third-party consultants that exist for the sole purpose of securing legacy ports and devices, so consider contacting them and relying on their expertise, particularly if your audit turns up a variety of unusual and potentially risky devices.In addition, I would ensure that the only way to access such ports is via an encrypted connection. This may require purchasing and installing a secondary hardware device, such as a VPN or multipurpose firewall, but it is imperative that this be accomplished - especially if the serial port in question manages a critical piece of public infrastructure.

(One can only imagine the havoc that can be wreaked on areas where the stoplight infrastructure has been hacked.). Dig Deeper on Network device security: Appliances, firewalls and switches.Related Q&A fromAllowing users to tunnel through a firewall to access any site creates a security risk. How big of a risk is it? It depends on how much you trust.Our IT organization needs to secure customer names, but also needs to conduct searches on the entire customer database to match and merge records.Don't treat physical and virtual machines' security differently. Since VM security issues threaten the whole infrastructure, here's how to stop.

Hi Lefty,Yes, I followed all the procedures listed in the serial port was still unable to be selected.According to this site, it tells 'You can check that the drivers have been installed by opening the Windows Device Mananger (in the Hardware tab of System control panel). Look for a 'USB Serial Port' in the Ports section; that's the Arduino board. 'When I opened the Widows Device Manager as instructed, I could not find a 'USB Serial Port'or the Ports section. What do you think is the problem?I did find an section in the device manager which appears as 'Other Devices' andin this section, USB-Serial Controller was included. However, the problem isthis controller could not be installed, at least that was what it said on the properties.Are there any ways, I can update the driver software to solve this problem?So far, I found no luck. Hi Lefty,Yes, I followed all the procedures listed in the serial port was still unable to be selected.According to this site, it tells 'You can check that the drivers have been installed by opening the Windows Device Mananger (in the Hardware tab of System control panel).

Look for a 'USB Serial Port' in the Ports section; that's the Arduino board. 'When I opened the Widows Device Manager as instructed, I could not find a 'USB Serial Port'or the Ports section. What do you think is the problem?I did find an section in the device manager which appears as 'Other Devices' andin this section, USB-Serial Controller was included.

However, the problem isthis controller could not be installed, at least that was what it said on the properties.Are there any ways, I can update the driver software to solve this problem?So far, I found no luck. I had the same problem on WinXP (3SP) but not in Win7 with the same board. After too many hours and some cups of coffee I found this: which includes (at the bottom of the page) an exe file with the name ch341ser.exe. I executed it and in less of few seconds the issue solved!

This company poduces clones with the same chipsets and microcontrolers but with software that runs. So, the 'USB2.0 ser' run out and UNO took a port under 'COM & LPT' section.

I have an Arduino Leonardo board that I have been successfully programming, on Windows 7 using IDE 1.6.4. But suddenly it is no longer recognized. It does not appear as a device in the computer device manager and it does not show up as available on a port, any port! The green 'power' light comes on and the bootloader makes the 'L' light blink after the board is reset, but no communication is possible thru Rx/Tx. I had been using pins 0-5 as outputs to LED's, pins 6-7 as outputs to drive solenoids, pins 8-12 as inputs from switches.

Circuit driving the solenoids included diodes for back-emf from the solenoids. It had been 'working', but I needed to make a small tweek and now I can no longer see the board, even with all other stuff stripped off the Leonardo board. What went wrong? It still runs the program I have loaded, but I cannot get the Rx/Tx lights to blink. Thanks, I downloaded CH341SER.ZIP, created a folder on the desktop, put CH341SER.zip in that folder, unzipped it and ran the Setup file, it took a moment with nothing then it told me it had successfully installed the driver.

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Surprise, it works great. It shows up as COM3: on my XP machine. Since I am not very good in non English languages here is the final link.

It should be the first file below download. 8/5/2015, lots of luck to all. I also run Mint on this machine and it worked just fine so I knew the hardware was OK.Find,Thanks Gil. I am having the same problem with the port being greyed out. I have an arduino mega 2560I am running a dual boot 64 bit laptop with Ubuntu 15.04 and Windows 8.1.