Avatar of classanets
classanets
 asked on

excessive wireless dropoffs with Dell tablets and VPN-based hosted application

Hello all,

I have a doctor’s office that has several wireless tablets and laptops, they’re all Dell’s based on the doctor’s individual preferences. Most are XT3 tablets.

We have a hosted application on the cloud with a VPN connection to the hosted data center using Comcast Internet and Cisco ASA devices. Prior to Comcast we had AT&T DSL. I only mention this, as we’ve had problems with both Internet providers on our end.

The problem is the doctors get booted off of the Remote Desktop session several times a day. Note again they are all wireless. Any of the offices hardwired machines do not get the session drop at the same time.

On one of the more common devices, I have done all the updates for the system -  bios, wireless adapter, video, even sata drive firmware,  etc. none of this has helped.

Since the hardwired desktops do not drop I have been focusing on the wireless is the issue. I have tried two different wireless access points, both on the higher end, both I’ve used before with great success. When I walked the office with the tablet I consistently have between 4 to 5 bars, which means 80 to 100%, no matter where I’m at.

I’m starting to suspect it is an issue with the VPN and wireless devices, whether it be timing, packet size, etc. related.

Any help or a direction would be greatly appreciated.

Happy holidays
Cloud ComputingVPNWireless NetworkingDell

Avatar of undefined
Last Comment
Dave Baldwin

8/22/2022 - Mon
gt2847c

Does the hosted app require the VPN be client based rather than a site to site?  IPSec VPNs do not recover well from dropped packets, so either switching to a site to site connection or an SSL VPN may help connectivity issues.
classanets

ASKER
It is a site to site VPN, I should've said that when I mentioned the Cisco ASA's.

No software VPN client involved at all.
Rob Williams

I would never use wireless for a mission critical application, random disconnects are why most accounting apps will not support wireless networks and specify this in their system requirements.  

A VPN exaggerates the dropped connection where a straight RDP connection should automatically reconnect and most users may not notice.  If it is server 2008 or newer you could use the TS Gateway service and connect securely using SSL and RDP with no need for VPN.

With a VPN over wireless you have dual encryption services and two services that can fail.
Your help has saved me hundreds of hours of internet surfing.
fblack61
manny_lenis

Are the access points all on the same channel?  Also keep in mind that they might be getting the disconnect when their device is switching from one access point to another. How big is the office abd how many access points? Are the access points all the same models? Also, what type of encrytion are you using?
Dave Baldwin

Having 4 or 5 bars does not mean it is because of your network.  I think you'll find it is just the cumulative signal strength of all the networks on that frequency.  I would use something like WirelessNetView http://www.nirsoft.net/utils/wireless_network_view.html to see how many other networks are in your area.
classanets

ASKER
To answer a few of the posted questions:

1) I totally agree wireless is not the best solution for a production network. Wireless in doctor's offices is more and more prevalent with the change in healthcare. As Doctors move towards electronic records management systems, they are carrying wireless devices into exam rooms, writing prescriptions and orders on the spot.  

2) We are using wpa2 encryption.

3) There is only one access point in the office. It is located in the center of the office and the exam rooms are all within 30 feet of the AP.
⚡ FREE TRIAL OFFER
Try out a week of full access for free.
Find out why thousands trust the EE community with their toughest problems.
Rob Williams

My point about wireless not being an ideal solution in a production environment was not related to security, though that is an issue, but rather wireless has a tendency to have minor disconnects due to surrounding EMI or other reasons, especially when the device is moving room to room.  With strait SSL-RDP this is not that significant an issue but with VPN's it is much more common, and with greater interruptions, though less so with site-to site VPN's than VPN clients.

I assume with medical records, replacing the VPN with RDP and SSL (TS Gateway)  is not an option.
Dave Baldwin

I suggested checking for other networks because if there are other doctor's offices next door, they will be doing the same thing with their networks and can be interfering with yours.
classanets

ASKER
Dave, an excellent suggestion. Oh yeah, there are many WL networks in the surrounding businesses. I will check into that and also changing channels ?
This is the best money I have ever spent. I cannot not tell you how many times these folks have saved my bacon. I learn so much from the contributors.
rwheeler23
ASKER CERTIFIED SOLUTION
Dave Baldwin

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
See Pricing Options
Start Free Trial
GET A PERSONALIZED SOLUTION
Ask your own question & get feedback from real experts
Find out why thousands trust the EE community with their toughest problems.
classanets

ASKER
Dave, you really got me in the right direction. I used the Nirsoft application and discovered about 13 wireless networks in the building and at least 5 or 6 on the same channel, 11. No one was using channel 8 so I changed to channel 8.

But also found what we think to be the real source of the issues: I have only been there once, this last Friday, when I saw the dropoffs. And when it happened I saw one of the docs walking down the hallway with a portable phone. yes, they have two of them I did not know about. And yes, they are 2.4 GHz. We are replacing them :-) Unbelievable that I did not catch that before now !
Dave Baldwin

Glad to help, thanks for the points.  WiFi was originally intended to be a low speed app for cash registers in stores.  Now it and the frequency band are being used for way too many things.