# Support - [How to submit an issue](https://docs.defguard.net/support-1/how-to-submit-an-issue.md) - [Sending support information](https://docs.defguard.net/support-1/sending-support-information.md) - [Core](https://docs.defguard.net/support-1/sending-support-information/core.md) - [Desktop Client](https://docs.defguard.net/support-1/sending-support-information/desktop-client.md) - [Mobile client](https://docs.defguard.net/support-1/sending-support-information/mobile-client.md) - [Troubleshooting Guides](https://docs.defguard.net/support-1/troubleshooting-guides.md): Before contacting support, check whether your problem is covered here. - [Core](https://docs.defguard.net/support-1/troubleshooting-guides/core.md) - [h2 protocol error from reverse proxy](https://docs.defguard.net/support-1/troubleshooting-guides/core/h2-protocol-error-from-reverse-proxy.md) - [Unable to sign in with correct credentials](https://docs.defguard.net/support-1/troubleshooting-guides/core/unable-to-sign-in-with-correct-credentials.md) - [User lost access to their 2FA methods](https://docs.defguard.net/support-1/troubleshooting-guides/core/user-lost-access-to-their-2fa-methods.md) - [Enrollment URL Changed](https://docs.defguard.net/support-1/troubleshooting-guides/core/enrollment-url-changed.md) - [Desktop Client](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client.md) - [Unix socket permission error on connect (Linux)](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/unix-socket-permission-error-on-connect-linux.md) - [MFA location disconnected after X-time](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/mfa-location-disconnected-after-x-time.md) - [High disk usage](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/high-disk-usage.md) - [Failed to configure DNS (Linux)](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/failed-to-configure-dns-linux.md) - [Failed to parse IP address](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/failed-to-parse-ip-address.md) - [Disconnecting shows "Connection failed" (Linux / NetworkManager)](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/disconnecting-shows-connection-failed-linux-networkmanager.md) - [resolvconf not found (Debian)](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/resolvconf-not-found-debian.md) - [Unix socket does not exist (Linux)](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/unix-socket-does-not-exist-linux.md) - [Disconnected after MFA timeout](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/disconnected-after-mfa-timeout.md) - [Could not start MFA process](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/could-not-start-mfa-process.md) - [Client connects but cannot reach VPN servers (MTU)](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/client-connects-but-cannot-reach-vpn-servers-mtu.md) - [Desktop client real-time / auto sync does not work](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/desktop-client-real-time-auto-sync-does-not-work.md) - [Windows client unable to connect](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/windows-client-unable-to-connect.md) - ["All traffic" connection issues](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/client-all-traffic-connection-issues.md) - [Windows installer exit codes](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/windows-installer-exit-codes.md): Desktop Client windows installer exist codes list. - [Mobile Client](https://docs.defguard.net/support-1/troubleshooting-guides/mobile-client.md) - [Android "Failed host lookup" error](https://docs.defguard.net/support-1/troubleshooting-guides/mobile-client/android-failed-host-lookup-error.md) - [Edge Component](https://docs.defguard.net/support-1/troubleshooting-guides/edge-component.md) - [There was a network error. Can't reach Edge](https://docs.defguard.net/support-1/troubleshooting-guides/edge-component/there-was-a-network-error.-cant-reach-edge.md) - [Gateway](https://docs.defguard.net/support-1/troubleshooting-guides/gateway.md) - [No buffer space available](https://docs.defguard.net/support-1/troubleshooting-guides/gateway/no-buffer-space-available.md) - [TOTP / email codes for MFA do not work](https://docs.defguard.net/support-1/troubleshooting-guides/totp-email-codes-for-mfa-do-not-work.md) - [WebAuthn security keys](https://docs.defguard.net/support-1/troubleshooting-guides/webauthn-security-keys.md) - [Can access VPN but not local network or internet](https://docs.defguard.net/support-1/troubleshooting-guides/can-access-vpn-but-not-local-network-or-internet.md) - [How to verify the VPN is working](https://docs.defguard.net/support-1/troubleshooting-guides/how-to-verify-the-vpn-is-working.md) - [Server migration and licence transfer](https://docs.defguard.net/support-1/server-migration-and-licence-transfer.md) - [Troubleshooting Guide V1 legacy backup](https://docs.defguard.net/support-1/troubleshooting.md): Here are some common issues / problems that are frequently encountered. - [Sending support information](https://docs.defguard.net/support-1/troubleshooting/sending-support-info.md) - [Client Windows installer exit codes](https://docs.defguard.net/support-1/troubleshooting/windows-installer-exit-codes.md): Desktop Client windows installer exist codes list. - [Client "All traffic" connection issues](https://docs.defguard.net/support-1/troubleshooting/client-all-traffic-connection-issues.md) - [WebAuthn security keys](https://docs.defguard.net/support-1/troubleshooting/webauthn-security-keys.md) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.defguard.net/support-1.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.