Error: “Cannot connect to server: please check network and try again” on Receiver

The request for resources/list can be very time consuming and can take upto 30 seconds in worst cases (depending on the performance of the network, StoreFront server or other components). This can cause timeout on the Receiver UI. But the response has been received successfully on the Receiver side.

Caution! Refer to the Disclaimer at the end of this article before using Registry Editor.

We can figure out whether this issue is caused by network latency by adding the following registry key on the client:

HKEY_LOCAL_MACHINESOFTWAREWow6432NodeCitrixDazzle

Reg_SZ WebUILoadingWatchDogTimeoutMs

WebUILoadingWatchDogTimeoutMs controls the timeout value of watchdog.

Alternately, turn off the Unified Experience in StoreFront (if Receiver 4.4 is being used).

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XenApp/XenDesktop USB Citrix Tested Device List

This article provides information regarding the USB devices used to test the generic USB remoting feature.

Note: Devices displayed are verified and any extra information required to configure them is included, with any limitations.

For device not given in below list, please refer Citrix Ready Marketplace.

Devices tested with XenDesktop 7.11 with Citrix Receiver for Windows 4.5. (see attached PDF for XenDesktop 7.6):

Device Type Win7, Win8, Win8.1, Win 10 Windows Server 2008 R2 Windows Server 2012 R2/2016
Optimized (Default) Generic Optimized(Default) Generic Optimized(Default) Generic
Mass Storage Device (PenDrive, USB Harddisk) Yes Yes Yes Yes Yes
Audio Device (Headset, Speaker) Yes Yes Yes Yes Yes
Webcam Device (Video Camera) Yes Yes Yes Yes Yes
SmartCard Readers * Yes Yes Yes
Keyboard * Yes Yes Yes Yes Yes
Mouse * Yes Yes Yes
3D Mouse Yes Yes
Scanner Yes Yes Yes Yes
Printer Yes Yes Yes Yes Yes
Phones (iOS) Yes Yes
Phones (Android) Yes Yes
Tablets (iOS)(Test with Ipad mini, Ipad3) Yes Yes
Tablets (Android) Yes Yes
Signature Pads (Wacom/Topaz) Yes Yes
Wacom Tablets Yes
DVD-Writer Yes Yes Yes Yes
USB 2.0 /3.0 hubs

Notes:

  • *Are restricted for usb redirection by GPO (recommended settings) Hub as a device is not redirected to VDA, however any devices plugged into hub will redirect seamlessly Modem Devices are blocked by the default policy MTP mode for Samsung devices gets policy restricted due to modem exposure to client.
  • Phones and Tablets are optimized by “Client USB Plug and Play device redirection” policy which is by default enabled for Windows Server OS only

For Server OS

The USB client drivers must be compatible with RDSH for Windows 2012 R2.

Non fully virtualized device such as Smart Card Reader has no USB support because these devices utilize the dedicated service running for session 0 (first session) on Windows Server VDA.

Mass Storage for Server OS is supported from 7.11 VDA.

Audio Device for Server OS is supported from Receiver 4.5 and VDA 7.8.

Encrypted USB redirection and Bitlocker to go devices are currently not supported with Server OS.

Device List

Overview of generic USB redirection support by USB device type (Virtual Delivery Agent for Desktop or Server OS).

Serial Number Make Model Notes/Comments
Mass Storage: For Server OS supported from 7.11 and safe eject from taskbar for server OS is not supported currently]
1 Sandisk 1GB Cruzer Micro U3 U3 autorun and eject features do not work within a xendesktop session
2 Sandisk 4GB Titanium U3 U3 autorun and eject features do not work within a xendesktop session
3 Sandisk MicroSD Card Reader (2Gb, 8Gb xD tested)
4 SanDisk 2GB Extreme III Compact Flash
5 Sandisk SDCZ64096A1 4GB Cruzer Micro with U3 Technology U3 autorun and eject features do not work within a xendesktop session
6 SanDisk SDCZ50 4G
7 SanDisk Cruzer Micro Skin 2GB
8 Kingston 1GB USB 2.0 Migo Personal
9 Kingston 1GB Secure Digital Flash Card
10 Kingston Data Traveller Mini
11 Kingston 4GB DataTraveler
12 Seagate USB Hard drive ST305004exd (1TB)
13 Seagate USB 3.0 Hard Drive 1TB (Sno. 122B657IM)
14 Lexar 1GB Flash Drive
15 Lexar USB Dongle (xD Card)
16 Lexar 2GB Jump drive
17 Lexar USB flash memory stick
18 Laguna USB device (CDROM + Flash drive/U3)
19 Trust 7 in 1 Card reader
20 Sumvision 3.5″ USB2.0 & eSATA enclosure
21 Corsair Flash Voyager 16 GB (Corsair)
22 FujiFilm xD-Picture Card 512MB
23 ioMEga Floppy plus 7-in-1 Card Reader Device drivers must be installed with an administrator privilege prior using this device.
24 PC Line PCL-EFD2X 3 1/2 Floppy Drive
25 Freecom FS-50 DVD +/- RW Does not work for Server OS
26 LaCie D2 Blu-Ray BluRay playback not supported over a network connection.
27 LG BE06 Blu-Ray/HD Player Super Multi Blue BluRay playback not supported over a network connection.
28 Microsoft 32MB Flash Drive
29 Belkin 256MB Mass Storage Device
30 Buffalo DVSM-PN58U2VB Device drivers must be installed with an administrator privilege prior using this device.
31 Lenovo USB2.0 memory stick
32 Transcend 16GB JetFlash 700 USB 3.0 Flash Drive
33 SSK USB3.0 8G/SFD201
34 Netac USB3.0 U903 8G
35 SAMSUNG SE-218CB DVD Writer Does not work for Server OS
36 SafeStick flash drive BLOCKMASTER BM9930
WebCams
1 Microsoft VX1000 LifeCam
2 Microsoft Lifecam VX-7000 The preview of video in Lync 2010 shows a black screen if device is connected to USB 3.0 port.
3 Microsoft Lifecam HD-3000
4 Logitech HD Pro C920 Sometimes, the device may appear in “Drives and Printers” on client even after launching a VDA session
5 Logitech C110
When a device is connected to VDA through the client, Sleep or hibernate action may be delayed on the Client machine.
6 Logitech QuickCam Pro 9000 Within session CPU usage might be high, when webcam is rediected to the VDA Session
7 Creative VF0520
8 Creative Live! Cam Notebook Webcam
9 Teclast TL-T838-NDE2S
10 Webcam Pro 9000
Incorrect webcam name may be shown in Devices tab in the Perference window.
11 HP True Vision Integrated webcam
Headsets/Speakers: [For Server OS enable audio through Generic USB from client policy, supported from Receiver 4.5 and XenApp / XenDesktop 7.8 ]
1 Logitech H330 (USB Headset)
2 Logitech S150 (USB Speakers)
3 Logitech H340 (USB Headset)
Audio experience may be unclear with Logitech H340 inside session
4 Plantronics Blackwire C435-M
5 Plantronics Blackwire C310-M
6 Plantronics Voyager Legend UC + BT300 (Bluetooth Headset + Bluetooth USB Adapter)
7 Plantronics Blackwire C320-M
8 SALAR KX235 USB headset-USB 2.0
HID style devices
1 Wacom Bamboo Fun A6 Wide Tablet Mouse class device. Blocked by default policy
2 Wacom Bambo One Mouse class device. Blocked by default policy
3 Wacom Bamboo touch tablet Mouse class device. Blocked by default policy
4 Bloomberg FreeBoard To use Bloomberg (Message) Key, Bloomberg Audio redirection has to be enabled.

If fingerprint scanner operation fails with high latency, then ICA custom channel has to be created for the scanner.
5 Bloomberg Starboard Requires two cables to be attached and for Server OS, enable Audio through Generic USB through the Client Policy
5 Vernier GoTemp Temperature Sensor
6 Vernier GoLink Multi Sensor
7 Kensington Orbit Mouse class device. Blocked by default policy
8 Microsoft Sidewinder X5 Mouse class device. Blocked by default policy, Requires Fingerprint driver locally
9 IBM KB with fingerprint reader Mouse class device. Blocked by default policy
Print/Scan Devices
1 Lexmark USB printer 800 series
2 Lexmark Multifunction USB printer scanner 1200 series
3 Canon Pixma MP620 -Multi Function Printer/Scanner
4 Canon iP5300 Printer
5 Canon CanScanLiDE 700F
6 Canon Lide 25 Colour Flatbed Scanner
7 Cannon Canon Pixma MP648
8 Canon CanoScan LiDE 110
9 HP ScanJet G3010
10 HP LaserJetP2014
11 HP DESKJET 2000
12 Epson Stylus DX4400 – multifunction AIO Printer/Scanner/Copier
13 WASP WCS3905 CCD barcode Scanner (USB) Displayed as a HID device, hence blocked by the default policy.
14 HP ScanJet Pro 3000S2 Twain 2.0 driver needs to be installed on client (Supported from 7.11)
Phone/PDA
1 Blackberry Pearl
2 Blackberry 8820
3 Blackberry 8320
4 Blackberry Curve 8900
5 Blackberry Curve 8520
6 Blackberry Curve 8900
7 Nokia N73 Mass storage mode working, PC Suite mode not available
8 Nokia N95 Mass storage mode working, PC Suite mode not available
9 Nokia 9500 Communicator Device can be visible on Receiver Toolbar by enabling the policy, but the device cant be redirected to the VDA session
10 HTC Tattoo
11 HTC Touch
12 Apple iPhone 3G Customers are not recommended to restore or upgrade the firmware on any Apple device. Device will remain in Restore mode until recovered on a physical machine.
13 Apple iPhone5 Customers are not recommended to restore or upgrade the firmware on any Apple device. Device will remain in Restore mode until recovered on a physical machine.
14 Polycom CX200 (Desktop Phone)
15 HP iPAQ 4150
16 Samsung Galaxy 4 MTP mode for samsung devices gets policy restricted due to modem exposed to client
17 Samsung Galaxy Core 2 MTP mode for samsung devices gets policy restricted due to modem exposed to client
18 Samsung Tablet MTP mode for samsung devices gets policy restricted due to modem exposed to client
HUBS: [Hubs are not supported as devices themselves however devices plugged into hubs work seamlessly]
1 Belkin 4-Port USB 2.0 Flex Hub
2 Plexus High Speed USB2.0 7 Port Powered Hub
3 Logitech 4 Port USB Hub
4 Dlink Dub-H4 USB 4 Port Hub
5 Belkin USB 2.0 4-Port Mini Hub
6 Belkin USB 4 PORT SLIM HUB (USB1.1)
7 Startech ST4202USBGB
8 Belkin 4-Port USB 2.0 Flex Hub
MODEM: [Modem Devices are blocked by the default policy]
1 LM Technologies Bluetooth EDR USB adapter
2 Trust USB Bluetooth Adaptor
3 Trust 56K USB Modem MD-1270
Security Devices
1 Microsoft Fingerprint Reader Win USB Only works with a local account and its known limitation of the vendor software
Digital Cameras
1 Canon PowerShot S70
2 Canon EOS 300D/Digital Rebel (Mass Storage)
3 Canon EOS 300D/Digital Rebel (PTP Mode)
4 Canon EOS 450D
5 Canon Ixus v3
6 Ricoh Capilio 500G Wide (Mass Storage)
7 Ricoh Capilio 500G Wide (Original Mode)
8 Nikon D70s (Mass Storage)
9 Nikon D70s (PTP Mode)
10 Fuji FinePix F31fd
Apple Devices: [ Customers are not recommended to restore or upgrade the firmware on any Apple device. Device will remain in Restore mode until recovered on a physical machine.]
1 Apple iPod Touch (16GB)
2 Apple iPod Shuffle (2GB)
3 Apple iPod Nano Ejecting an iPod Nano from within iTunes can take up to 3 minutes.
Other devices
1 Nipco USB Missile rocket launcher
2 Dictaphone Foot Control USB adapter
3 3DConnexion Space Navigator
4 3DConnexion Space Pilot Pro
5 3DConnexion Space Explorer
6 Startech SVID2USB2
7 Aigo DPF5170 (USB photo frame)
8 Plantronics Calisto 619 (Bluetooth Wireless Speakerphone + Bluetooth USB Adapter )
9 D-Link DBT-122 (Wireless USB Bluetooth Adapter)
10 Buffalo DVSM-PN58U2VB (USB DVD-RW) Does not work for Server OS
11 Wacom Signature Pad STU430 , STU 530
12 Wacom Tablet Intuos Pro Not supported for Server OS
13 Wacom interactive pen display DTU1031 Not supported for Server OS
14 Topaz Signature Pad T- LBK 460 Topaz driver is required on vda (if installation fails, extract driver package and then install driver Manually)
15 Philips Speech Mike Pro
USB host Controller for 3.0 port
1 Renesas Electronics USB 3.0 Host Controller Drivers
2 Microsoft USB Host Controller Drivers Supported from Windows 8 OS onwards.

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Dell Technologies and Altiostar partner to accelerate adoption of open and virtualized RAN Over the last several years, 5G has been a cornerstone of the telecommunications industry technology development  – defining a radio air interface and technology architecture for the core network. Now that the promise of 5G is becoming a reality, industries looking to transform are implementing new use cases for 5G that are defining new network “edges” that foundationally change traffic flows and data analytics pipelines in Telecom networks. The snowball effect of the NFV transition started in 2012 with a focus on 4G … READ MORE

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[ADC] – MFA keeps sending notification


To accommodate high NPS response time, increase the timeout on NetScaler using the following command:

set ns timeout -newConnIdleTimeOut 30

set ns timeout -nontcpZombie 90


The only issue with higher connection timeout is to keep the connections longer, which will hold the memory little longer.

If this setting help fix the issue, Customer can further optimize this time.

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SD-WAN QoS – FAQ

2. What type of traffic is allocated by default to different Classes?

In the SD-WAN environment, we think of applications as falling into one of the following three classes:

Real-time –VoIP or VoIP like applications, such as Skype or ICA audio. In general, we refer to voice only applications that use small UDP packets that are business critical

Interactive – This is the broadest category, and refers to any application that has a high degree of user interaction. Some of these applications, for example video conferencing, is sensitive to latency, and requires high bandwidth. Other applications like HTTPS, may need less bandwidth, but are critical to the business. Interactive applications are typically transactional is nature.

Bulk – This is any application that does not need rich user experience but is more about moving data (i.e. FTP or backup/replication)

3. How real-time class works vs interactive:

Real-time (RT) classes are given the highest priority and gets up to 50% of the overall scheduler time. Each class can be weighted with respect to the other RT classes, for example, we could have two RT classes one that weighted to 70% and the other to 30%.

Interactive (INT) classes take the next priority and can consume the rest of the scheduler time as the traffic demands. Individual INT classes can be weighted and by default we have 4 weights (high, medium, low and very low) defined.

4. Will bulk suffer if interactive and real-time flows are there?

Yes, Bulk traffic is serviced after real-time and interactive traffic are serviced. Typically, a bulk class gets a lower sustained share % than an interactive class.

5. How QoS classes are prioritized?

Real-time (RT) classes are given the highest priority and gets up to 50% of the overall scheduler time. Each class can be weighted with respect to the other RT classes, for example, we could have two RT classes one that weighted to 70% and the other to 30%.

Interactive (INT) classes take the next priority and can consume the rest of the scheduler time as the traffic demands. Individual INT classes can be weighted and by default we have 4 weights (high, medium, low and very low) defined.

Bulk (BLK) classes takes the lowest priority and can be considered scavenge classes. They can be weighted but they can be completely starved of bandwidth if the INT/RT traffic is consuming all of the scheduler time.

6. What is the purpose of “Retransmit Lost Packets” option under WAN General, IP Rules?

If the receiving SD-WAN appliance detects a missing packet it can request that packet to be resent by the sending SD-WAN appliance.

7. What is the Criteria for the QoS calculation?

QoS is always calculated on the Send Side.

The Fair Share calculation for the services is based on Per Wan Link.

8. What is Duel Ended QoS?

The Receive side sends the Control Packets to advertise the available bandwidth before the actual Data transfer is initiated.

9. How is share provided during contention?

Please refer this article: https://support.citrix.com/article/CTX256716

10. Difference between the Drop Limit and Drop Depth:

Drop Limit: If the Estimated exceeds the threshold, the packet will be discarded. Not valid for Bulk Classes

Drop Depth (Send Buffer): The Max amount of estimated time that packets smaller than the large packet size will have to wait in the class scheduler. If the queue depth exceeds the threshold, the packet will be discarded and the statistics will be counted.



11. How Drop Limit is calculated (MS)?

Number of bytes Queued divided by Bandwidth available for the class.

12. What are transmit modes based on?

•Persistent path – Based on the latency. If there’s a latency >50mS then there will be a penalty on that path and a new path will be chosen.

•Load Balanced Path– Based on the packet Loss.

•Duplicate paths: Packets will be duplicated over the WAN links.

13. What is MOS (Mean opinion Score) under rule groups?

This Feature gathers application statistics from WAN to LAN side of the Virtual path. It Measure of the quality of the experience that an application delivers to end users. It is primarily used for VoIP applications. In SD-WAN, MOS is also used to assess the quality of non-VoIP applications.

14. What is Application QoS and how to implement it?

By default on the SD-WAN, we have pre-defined Application Family based on the type of the application in the incoming Traffic. For Example: Anti-Virus, Microsoft Office, etc…

It is also possible to create Custom application object.

15. QoS Fairness (RED):

Please refer to this Document:

https://docs.citrix.com/en-us/netscaler-sd-wan/10/quality-of-service/qos-fairness.htm

16. Do we have an option to enable Auto Bandwidth provisioning?

Yes, from SD-WAN Version 10.2.x we have an option under Site —> Wan Links —> Provisioning to enable Auto-Bandwidth Provisioning.

17. What is Auto-Bandwidth Provisioning?

When enabled, the shares for all services defined in the Provisioning section will be auto calculated and applied according to the size of Bandwidth that may be required for the remote sites.

18. How to diagnose if an issue is with SD-WAN or not with respect to QoS?

Based on Multiple factors:

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