Category Archives: Hotfix

Quick solutions to common problems.

Setting Roam Aggression on Windows Computers

What is Wireless Roaming?

Access Points

To understand what roaming is, you first have to know what device makes the software function necessary.

If you are only used to household internet setups, the idea of roaming might be a little strange to think about. In your house you have your router, which you connect to, and that’s all you need to do. You may have the option of choosing between 2.4GHz and 5GHz channels, however that’s as complicated as it can get.

Now imagine that your house is very large, let’s say the size of UMass Amherst. Now, from your router in your living room, the DuBois Library, it might be a little difficult to connect to from all the way up in your bedroom on Orchard Hill. Obviously in this situation, the one router will never suffice, and so a new component is needed.

An Access Point (AP for short) provides essentially the same function as a router, except that multiple APs used in conjunction project a Wi-Fi network further than a single router ever could. All APs are tied back to a central hub, which you can think of as a very large, powerful modem, which provides the internet signal via cable from the Internet Service Provider (ISP) out to the APs, and then in turn to your device.

On to Roaming

So now that you have your network set up with your central hub in DuBois (your living room), and have an AP in your bedroom (Orchard Hill), what happens if you want to go between the two? The network is the same, but how is your computer supposed to know that the AP in Orchard Hill is not the strongest signal when you’re in DuBois. This is where roaming comes in. Based on what ‘aggressiveness’ your WiFi card is set to roam at, your computer will test the connection to determine which AP has the strongest signal based on your location, and then connect to it. The network is set up such that it can tell the computer that all the APs are on the same network, and allow your computer to transfer your connection without making you input your credentials every time you move.

What is Roam Aggressiveness?

The ‘aggressiveness’ with which your computer roams determines how frequently and how likely it is for your computer to switch APs. If you have it set very high, your computer could be jumping between APs frequently. This can be a problem as it can cause your connection to be interrupted frequently as your computer authenticates to another AP. Having the aggressiveness set very low, or disabling it, can cause your computer to ‘stick’ to one AP, making it difficult to move around and maintain a connection. The low roaming aggression is the more frequent problem people run into on large networks like eduroam at UMass. If you are experiencing issues like this, you may want to change the aggressiveness to suit your liking. Here’s how:

How to Change Roam Aggressiveness on Your Device:

First, navigate to the Control Panel which can be found in your Start menu. Then click on Network and Internet.

From there, click on Network and Sharing Center. 

Then, you want to select Wi-Fi next to Connections. Note: You may not have eduroam listed next to Wi-Fi if you are not connected or connected to a different network.

Now, select Properties and agree to continue when prompted for Administrator permissions.

After selecting Configure for your wireless card (your card will differ with your device from the one shown in the image above).

Finally, navigate to Advanced, and then under Property select Roaming Sensitivity Level. From there you can change the Value based on what issue you are trying to address.

And that’s all there is to it! Now that you know how to navigate to the Roaming settings, you can experiment a little to find what works best for you. Depending on your model of computer, you may have more than just High, Middle, Low values.

Changing roaming aggressiveness can be helpful for stationary devices, like desktops, too. Perhaps someone near you has violated UMass’ wireless airspace policy and set up and hotspot network or a wireless printer. Their setup may interfere with the AP closest to you, and normally, it could cause packet loss, or latency (ping) spiking. You may not even be able to connect for a brief time. Changing roaming settings can help your computer move to the next best AP while the interference is occurring, resulting in a more continuous experience for you.

PDF Threat!

According to a recent Tech-news-media-blits, Adobe has pushed out a highly critical security update to its Adobe Reader and Acrobat software. The update fixes a highly critical flaw in which code imbedded into a PDF file will be automatically executed.

I have never been a huge fan of Adobe Reader’s excessively long load times and browser instabilities. I have been a longtime user of Foxit Software’s Foxit Reader. Foxit Reader is a much smaller and lighter PDF reader but it does not support all of the latest functionality that is implemented in the newest versions by Adobe. Furthermore, it was also vulnerable to the same recent threats, although Foxit Software was much faster to respond to the threat.

Disclaimer: Foxit Reader is 3rd party software and although it is recommended by this consultant, it is not supported by OIT.

However, this is not the first time that Adobe has needed to fix it’s code, which is another reason to use Foxit Reader.

We recommend to all our users to upgrade to the latest version of Adobe Reader and/or Foxit Reader immediately.

But as of now there is no evidence that any malicious code or trojan has been written to take advantage of the security hole.

Details about the vulnerability and proof-of-concept videos can be found here for the inquiring minds.

“Conficker Worm Could Create World’s Biggest Botnet”

I saw this article on Slashdot today and wanted to warn everyone out there. Nine million infected computers running Microsoft systems is an incredible amount of machines compromised.

Make sure your McAfee Enterprise is up to date and your Windows machine has installed all the latest updates!

As the article states, the worm propagates through un-patched Windows systems and through USB thumb-drives. This means that having a secure system or up-to-date virus protection is NOT ENOUGH! You need a combination of both. This is good computer usage in practice anyway, but we see an incredible amount of un-patched XP and Vista systems come in with virus infections.

What you see when an infected USB-drive is plugged-in

What you see when an infected USB-drive is plugged-in

The above image shows what happens when you plug-in an infected USB-stick into a machine. Notice the “Publisher not Specified,” text in gray under the open option? That should be your first clue right there. Do NOT click on this, as this will launch the virus and infect your computer.

It’s just that little yellow icon in your system tray, that little place with icons by the time in the bottom left. Click – Express Install – Done. It’s really that simple.

For those that are interested, the Microsoft Security Bulletin can be read here.