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Eric Ogren's picture
Eric Ogren

Security Impact

Customer experiences thin clients

One of the things I enjoy doing is talking with IT about the problems they are trying to solve with certain vendors, and where they want to be within the next two years. It provides nice balance to the messages the vendor is giving throughout a briefing. The conversation is on background only, which means that the conversation is often open and lively. One vendor customer check I did last week was on a manufacturer of advanced thin client devices. I seldom repeat these conversations, especially when the vendor is not even a client of mine. However, the customer had a few points on thin clients that I thought were worth sharing:

  • The customer has the server-based computing religion. Virtualization in the data center supports a distributed user community. The primary application requirements were Citrix and VoIP. The ability to dynamically add digital protocol services in the future within the centralized server model. The biggest security benefits are ease of configuration management as compared to desktops, and the lack of persistent storage that must be protected. It is much easier to keep consistently compliant endpoints in the workforce when they are served from the central servers.
  • Digital telephony support was a major factor for the customer. VoIP support, routed through telephony servers in the corporate data center, was essential in addition to the standard ICA and RDP protocols. They plug a headset into the USB port of the thin client and off they go. The company saves the expense of purchasing and maintaining separate VoIP phones and controls all configurations automatically from centralized servers.
  • The customer expects the thin clients to have a life span of 10 yrs. Compare that to refresh cycles for desktops and laptops. He told me he got 11 years out of his just-replaced Dell kit. I do not know if that's normal, but I do admit there are no moving parts (disks, fans) that might break. This has to save considerable costs not only in products, but in reduced help desk calls which frees people up for other security tasks.

It turns out that the securing sensitive data residing on shared devices (e.g. point of sale systems, hospital kiosks, bank teller stations) was not a factor in the decision making process for this customer. Control of the endpoint configuration for converged processing of data and voice, however was huge. And I still think the long life-cycle is incredible.

What People Are Saying

It is almost impossible to

It is almost impossible to fully review the current POS systems before the next wave hits the retail and hospitality sectors; enter the thin client POS. It wasn't long ago that retailers took for granted the large cash registers. They were a burden that retailers endured. Few industry professionals gave the POS system a second thought.

Thin clients aren't that thin, really.

I work for a POS dealer. We sell workstations that have a touchscreen, disk-on-chip 128MB, a compact flash card 128MB up to 16GB, and an AMD LX800 processor, and run Windows CE. The back office server is a PC running Windows XP or 2003 server.
Now, I think these workstations would still be considered a thin client, but they're powerful enough that we also have POS software that runs on them without a back office server.
And when you look at the specs of the machine, it's actually a whole lot more powerful than the 386 25Mhz Unix system I ran a whole medical office on, 7 dumb terminals and 4 printers, just a decade ago.
Reliability on these systems is pretty high, even more so on the ones that don't require a Windows based back office server, and 10 year lifespan is not uncommon in the POS world.

Thin Clients

I have used thin clients a fair bit. The new ones are fanless and tiny. There are all kinds of pluses:

*heat is dumped in the server room where the noise doesn't bother users
*the real desktop is available for paper and stuff
*I see failure rates less than 1% per annum so 10 years should be OK (none have failed yet)
*they are inexpensive
*configuring one server is much easier than N desktops
*with a 'NIX OS on the terminal server one gets more users per server and better responsiveness than thick clients because of shared memory and fancy RAID storage
*with GNU/Linux I can avoid per-seat licence fees
*if one fails, an ordinary human can just plug another in its place

For everything except full-screen video, I would use thin clients almost everywhere.