Anydesk 502 Bad Gateway

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8 Mar 2021

• Added global security settings:
  Added global security setting to lock the remote account. If active the corresponding session setting will be ignored.
• Bugfix:
  Fixed network detection
• Bugfix:
  Fixed image glitches occurring during sessions
• Bugfix:
  Could block remote input without input permissions granted
• Bugfix:
  Could lock the remote account without input permissions granted
• Updated translations:
  Updated translations for German, English and Italian
• Added translations:
  Added Lithuanian translation. Many thanks to Andrius Balsevičius!

18 Feb 2021

• Bugfix:
  Fixed crash when opening installer.
• Bugfix:
  Fixed crash when opening settings in in-only Cutsom Clients.

Anydesk 502 Bad Gateway Password

12 Feb 2021

• Custom clients usability improvement:
  Added UI setting to permanently remove tiles from the main view of custom clients related to password for unattended access, Whats new and Discovery.
• Address Book entries handling:
  Added pagination to Address Book to fix too many entries issue.
• Bugfix:
  Fixed crash when closing a session.

27 Jan 2021

• Bugfix:
  Fixed bug that caused elevation requests to fail.

21 Jan 2021

• New option for unattended access:
  Added option --remove-password to remove password for unattended access via command line.
• Memory usage improvement:
  Improved memory usage when using preserve details option.
• Bugs for custom clients with Incoming connection only configuration:
  Fixed window size problems in some cases in incoming connection only client. Fixed alias registration in incoming connection only clients.
• Crash during privacy mode:
  Fixed crash related to muting audio during privacy mode.
• Windows login screen keyboard issues:
  Fixed bug that caused incorrect keyboard handling on windows login screen.
• Address Book tags issue:
  Fixed bug that caused address book tags to not show on individual addresses.
• Bugfixes:
  Fixed a couple of small bugs.

Anydesk 502 Bad Gateway

8 Dec 2020

• Revised various user interface elements:
  Revised favorites and recent session lists. Revised session recording settings.
• Better interaction with system clipboard:
  Address Book, Auto-Discovery, Favorites and Recent Sessions now interact with the system clipboard.
• Added new options for sessions:
  Added option to limit number of incoming/outgoing sessions for custom clients. Added option to automatically disconnect incoming sessions when inactive.
• Added new options to enhance usage:
  Added option to follow remote window focus. Added display option to preserve details when encoding image. Added option to keyboard menu to send special Android keys.
• One time password check improvement:
  Improved one time password checks in two factor authentication.
• Fixed crashes in various situations:
  Fixed crash when requesting elevation. Fixed crash in session player when skipping to the beginning of a recording. Fixed crash caused by invalid thumbnails when searching for addresses. Fixed crash when updating Windows Group Policies.
• Fixed bugs related to sessions:
  Fixed bug that caused keyboard mode to be reset every session. Fixed bug that caused sessions settings for remote cursor to not save correctly. Fixed bug that caused empty session recordings to be created. Fixed rare bug that caused settings configured via Group Policies to not work correctly.
• Fixed bug related to language selection:
  Fixed language detection for some asian languages. Fixed language selection on Windows XP.
• Bugfixes:
  Fixed a couple of small bugs.

1 Sep 2020

• Improved iOS support:
  Support for improved connections to iOS devices.
• Bugfixes:
  Fixed a couple of small bugs.

28 Jul 2020

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• AnyDesk closes immediately after start:
  Fixed bug that could cause AnyDesk to close immediately after starting.
• Bugfixes:
  Fixed a couple of small bugs.

21 Jul 2020

• Adress Book bugfixes:
  Fixed crash in Address Book. Fixed renaming of Address Book entries.
• Bugfixes:
  Fixed a couple of small bugs.

10 Jul 2020

• Languages support:
  Updated translations for various languages.
• Address Book:
  Made the Address Book open on startup again.
• Bugfixes:
  Fixed a couple of small bugs.

25 Jun 2020

• Two-Factor Authentication:
  When enabled, an additional dialog will be shown after authentication by password or token, requesting a time-based one-time password provided by a third device. This feature requires an app supporting TOTP.
• Wake-on-Lan:
  When enabled, devices running AnyDesk that are currently in sleep mode can be woken up by other AnyDesk devices in the same local network.
• Windows Group Policies:
  AnyDesk now checks the Windows Registry for settings provided via Windows Domain Group Policies. This can only be disabled on Custom Clients.
• Multiple password for Unattented Access:
  Unattended Access now allows the setup of multiple secondary passwords. Each of the password can be bound to different permissions. This feature requires the use of Windows Group Policies.
• Flexible Session Recordings:
  Session Recordings can now be started and stopped at any time.
• Interactive Access improvement:
  Immediately installing AnyDesk now allows to connect to that Desk directly from the beginning.
• User interface improvements:
  User interface has been updated and now also allows to hide the sidebar on the left and the Remote Desk box.
• Security improvement:
  AnyDesk now supports Perfect Forward Secrecy to strengthen its already strong security for data transfer.
• Remote printing improvement:
  AnyDesk now allows to pring local files on the remote computer.
• Multi-monitor suppport:
  Hotkeys can now be used to switch between the remote monitors. Hotkey combination Ctrl+Alt+Shift+left/right to iterate monitors. Hotkey combination Ctrl+Alt+Shift+numpad_number to switch to a specific monitor.
• Improved installation process:
  Reduced the amount of UAC dialogs shown during installation of different components of AnyDesk.
• Language support:
  Updated translations for various languages.
• Remote printing in Windows 7:
  Fixed a remote printing in Windows 7.
• Bugfixes:
  Fixed a lot of small bugs.

9 Apr 2020

• Bugfix:
  Fixed a timer duration exceeding integer boundaries.

3 Apr 2020

• Error handling:
  Improved error handling.
• Custom client:
  Fixed Privacy Mode for Custom Clients.
• Bugfixes:
  Fixed a couple of small bugs.

11 Mar 2020

• Invitation link in main view:
  Reintroduced the invitation link in the main view. This feature requires a properly set up default mail client to work.
• Send support information feature:
  The link 'Send Support Information..' on the page 'About AnyDesk' in the settings now tries to create an e-mail. This feature requires a properly set up default mail client to work.
• Settings page:
  Added an option to set up an Alias on the UI settings page.
• Incoming session new feature:
  The backend user can now accept an incoming session request and immediately request elevation.
• Discovery feature security:
  Significantly improved security of Discovery feature.
• Session UI improvement:
  The toolbar can now be hidden during a session via the session tab menu. The remote activity indicators can now be de-/activated by clicking on them.
• File Manager:
  The File Manager enabled file upload even though it was disallowed. An additional monitor appeared on opening the File Manager.
• Custom client:
  Custom Clients may have cut ID and Alias in a list view. Custom Clients allowing only incoming sessions did not support Remote Restart.
• Service:
  Fixed a deadlock in the service making it unresponsive to session requests. Fixed a crash in the service when connecting to multiple IDs at once.
• Bugfixes:
  Fixed couple of small bugs and occasional crashes.

18 Dec 2019

• Bugfixes:
  Fixed some minor bugs.

21 Nov 2019

• New Privacy feature for Windows 8 and 10:
  Enabling privacy mode during a session will turn off the monitor on the remote side so the screen content is hidden.
• Seeking in session player:
  Session player can now jump into specific point in time.
• Address Book usability:
  Address Book items offer to create TCP tunnel.
• File Manager:
  File Manager address field now handles Enter key properly and shows remote folder content after switching sides.
• Bugfixes:
  Fixed automatic registration of aliases in custom namespaces and couple of other small bugs.

1 Oct 2019

• Usability:
  Address field is now in focus upon window start.
• Android compatibility:
  Added support for Android special keys.
• Translations:
  Translations have been updated.
• Bugfixes:
  Fixed couple of small bugs.

9 Sep 2019

• New set of permissions used during unattended access:
  New permissions must be enabled and will used in case session has been started using password or token.
• Performance and Usability:
  Improved performance and usability of the new user interface.
• Bugfixes:
  Fixed a couple of small bugs.

12 Jul 2019

• Discovered clients in search:
  Discovered clients can be searched for now by using user name, Alias, client ID, machine name and operating system.
• Bugfixes:
  Fixed a couple of small bugs.

7 Jun 2019

• Bugfixes:
  Fixed a couple of small bugs.

6 Jun 2019

• Custom Client Layout:
  Added a new minimalistic layout for customer generated clients that only support incoming connections.
• Bugfixes:
  Fixed a couple of small bugs.

27 May 2019

• Bugfixes:
  Fixed a crash when AnyDesk could not find a preview image.
• Welcome Panel:
  Changed images for welcome panel.

23 May 2019

• Bugfixes:
  Fixed a few major and minor bugs.
• Usability:
  A couple small usability improvements.

15 May 2019

• TCP Tunnels:
  Added TCP Tunneling (or Port-Forwarding) for running sessions.
• Bugfixes:
  Fixed many major and minor bugs.
• Performance and Usability:
  Improved performance and usability of the new user interface.
• Translations:
  Improved translations.

12 Apr 2019

• Bugfixes:
  Fixed several bugs that occasionally lead to crashes and freezes.
• Installer:
  Progressbar for the installer.
• Translations:
  Updated polish translations.
• Welcome Tab:
  Updated the welcome tab.

8 Apr 2019

• Bugfixes:
  Stability improvements and fixed default audio record settings.

5 Apr 2019

• Bugfixes:
  Fixed many minor bugs.
• Updated translations:
  Updated translations for Chinese, Portuguese, French and Russian.

4 Apr 2019

• Address Book:
  Fixed a few minor bugs in the Address Book.
• Command Line:
  Security improvements regarding blocking outgoing sessions.
• Auto Discovery:
  Start Auto-Discovery automatically when AnyDesk is installed.
• Address Book:
  Added the right click menu.

29 Mar 2019

• User Interface:
  Small improvements of the new user interface.
• Stability:
  Fixed a rare case that can cause AnyDesk to not respond or crash.
• Connection Trace:
  Tracefile was sometimes not stored correctly when AnyDesk is installed.

27 Mar 2019

• NEW User Interface:
  Completely new and modern design for AnyDesk with many usability improvements.
• Address book:
  Greatly improved address book with drag & drop and better handling.
• Remote Printing:
  Support for remote printing on Windows 7, 8 and 10.
• Auto Discovery:
  New feature that allows AnyDesk to find other clients inside your local network.
• Remote Cursor:
  Fixed bugs relating to the remote cursor and fullscreen mode.
• Stability:
  Fixed several bugs that can lead to crashes in special situations.
• Localization:
  Updated translations.

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Learn how to troubleshoot bad gateway (502) errors received when using Azure Application Gateway.

Note

This article has been updated to use the Azure Az PowerShell module. The Az PowerShell module isthe recommended PowerShell module for interacting with Azure. To get started with the AzPowerShell module, see Install Azure PowerShell. To learn howto migrate to the Az PowerShell module, seeMigrate Azure PowerShell from AzureRM to Az.

Overview

After configuring an application gateway, one of the errors that you may see is 'Server Error: 502 - Web server received an invalid response while acting as a gateway or proxy server'. This error may happen for the following main reasons:

• NSG, UDR, or Custom DNS is blocking access to backend pool members.
• Back-end VMs or instances of virtual machine scale set aren't responding to the default health probe.
• Invalid or improper configuration of custom health probes.
• Azure Application Gateway's back-end pool isn't configured or empty.
• None of the VMs or instances in virtual machine scale set are healthy.
• Request time-out or connectivity issues with user requests.

Network Security Group, User Defined Route, or Custom DNS issue

Cause

If access to the backend is blocked because of an NSG, UDR, or custom DNS, application gateway instances can't reach the backend pool. This causes probe failures, resulting in 502 errors.

The NSG/UDR could be present either in the application gateway subnet or the subnet where the application VMs are deployed.

Similarly, the presence of a custom DNS in the VNet could also cause issues. A FQDN used for backend pool members might not resolve correctly by the user configured DNS server for the VNet.

Solution

Validate NSG, UDR, and DNS configuration by going through the following steps:

• Check NSGs associated with the application gateway subnet. Ensure that communication to backend isn't blocked.
• Check UDR associated with the application gateway subnet. Ensure that the UDR isn't directing traffic away from the backend subnet. For example, check for routing to network virtual appliances or default routes being advertised to the application gateway subnet via ExpressRoute/VPN.

• Check effective NSG and route with the backend VM

• Check presence of custom DNS in the VNet. DNS can be checked by looking at details of the VNet properties in the output.

If present, ensure that the DNS server can resolve the backend pool member's FQDN correctly.

Problems with default health probe

Cause

502 errors can also be frequent indicators that the default health probe can't reach back-end VMs.

When an application gateway instance is provisioned, it automatically configures a default health probe to each BackendAddressPool using properties of the BackendHttpSetting. No user input is required to set this probe. Specifically, when a load-balancing rule is configured, an association is made between a BackendHttpSetting and a BackendAddressPool. A default probe is configured for each of these associations and the application gateway starts a periodic health check connection to each instance in the BackendAddressPool at the port specified in the BackendHttpSetting element.

The following table lists the values associated with the default health probe:

Solution

• Ensure that a default site is configured and is listening at 127.0.0.1.
• If BackendHttpSetting specifies a port other than 80, the default site should be configured to listen at that port.
• The call to http://127.0.0.1:port should return an HTTP result code of 200. This should be returned within the 30-second timeout period.
• Ensure that the port configured is open and that there are no firewall rules or Azure Network Security Groups, which block incoming or outgoing traffic on the port configured.
• If Azure classic VMs or Cloud Service is used with a FQDN or a public IP, ensure that the corresponding endpoint is opened.
• If the VM is configured via Azure Resource Manager and is outside the VNet where the application gateway is deployed, a Network Security Group must be configured to allow access on the desired port.

Problems with custom health probe

Cause

Custom health probes allow additional flexibility to the default probing behavior. When you use custom probes, you can configure the probe interval, the URL, the path to test, and how many failed responses to accept before marking the back-end pool instance as unhealthy.

The following additional properties are added:

Solution

Validate that the Custom Health Probe is configured correctly as the preceding table. In addition to the preceding troubleshooting steps, also ensure the following:

• Ensure that the probe is correctly specified as per the guide.
• If the application gateway is configured for a single site, by default the Host name should be specified as 127.0.0.1, unless otherwise configured in custom probe.
• Ensure that a call to http://<host>:<port><path> returns an HTTP result code of 200.
• Ensure that Interval, Timeout, and UnhealtyThreshold are within the acceptable ranges.
• If using an HTTPS probe, make sure that the backend server doesn't require SNI by configuring a fallback certificate on the backend server itself.

Request time-out

Cause

When a user request is received, the application gateway applies the configured rules to the request and routes it to a back-end pool instance. It waits for a configurable interval of time for a response from the back-end instance. By default, this interval is 20 seconds. If the application gateway does not receive a response from back-end application in this interval, the user request gets a 502 error.

Solution

Application Gateway allows you to configure this setting via the BackendHttpSetting, which can be then applied to different pools. Different back-end pools can have different BackendHttpSetting, and a different request time-out configured.

Empty BackendAddressPool

Cause

If the application gateway has no VMs or virtual machine scale set configured in the back-end address pool, it can't route any customer request and sends a bad gateway error.

Solution

Ensure that the back-end address pool isn't empty. This can be done either via PowerShell, CLI, or portal.

The output from the preceding cmdlet should contain non-empty back-end address pool. The following example shows two pools returned which are configured with a FQDN or an IP addresses for the backend VMs. The provisioning state of the BackendAddressPool must be 'Succeeded'.

BackendAddressPoolsText:

Unhealthy instances in BackendAddressPool

Cause

If all the instances of BackendAddressPool are unhealthy, then the application gateway doesn't have any back-end to route user request to. This can also be the case when back-end instances are healthy but don't have the required application deployed.

Solution

Ensure that the instances are healthy and the application is properly configured. Check if the back-end instances can respond to a ping from another VM in the same VNet. If configured with a public end point, ensure a browser request to the web application is serviceable.

Next steps

If the preceding steps don't resolve the issue, open a support ticket.