# Client

Last validated Jan 29, 2026

* [Coordination server reports an issue](/docs/reference/messages/client/coordination-server-issue) — Coordination server issues can stem from connectivity problems. Check your network, firewall, or restart the Tailscale client.

* [Could not apply configuration](/docs/reference/messages/client/could-not-apply-config) — Envknob errors stem from misconfigurations or conflicts. Fixing them involves reviewing settings and restarting the client.

* [Docker with stateful filtering](/docs/reference/messages/client/docker-stateful-filtering) — Docker's firewall may conflict with Tailscale's stateful filtering. Adjust iptables or use Tailscale CLI to restore container connectivity.

* [Encrypted connection failed](/docs/reference/messages/client/tls-connection-failed) — The Tailscale client could not establish a secure, encrypted connection with a peer or control plane because the required cryptographic handshake failed.

* [Invalid packet filter](/docs/reference/messages/client/invalid-packet-filter) — The coordination server may send an unsafe packet filter. Check your tailnet policy and firewall rules, then restart the Tailscale client to resolve the issue.

* [Linux DNS configuration issue](/docs/reference/messages/client/resolv-conf-overwritten) — The client can't apply DNS settings on Linux. Enable systemd-resolved, run tailscaled as root, or manually configure DNS.

* [Local log misconfiguration](/docs/reference/messages/client/local-log-config-error) — The Tailscale client cannot initialize local connectivity logging due to a misconfigured or inaccessible log destination, limiting debug visibility.

* [MagicSock function not running](/docs/reference/messages/client/magicsock-receive-func-error) — A core MagicSock function failed. You can restart or update the client, check UDP firewall settings, or reinstall to restore connectivity.

* [Network down](/docs/reference/messages/client/network-status) — The Tailscale client detects no network. Check your internet connection and restart the client to restore connectivity.

* [Network map response timeout](/docs/reference/messages/client/network-map-response-timeout) — The Tailscale client did not receive a network map from the control plane in time, preventing it from updating network state and potentially affecting connectivity.

* [No home relay server](/docs/reference/messages/client/no-derp-home) — The client can't connect to any DERP relay. Check internet, restart the client, or review firewall settings to restore fallback connectivity.

* [Out of sync](/docs/reference/messages/client/not-in-map-poll) — The client can't sync with the coordination server. Check internet, firewall, or device restrictions to maintain peer connectivity.

* [Relay server unavailable](/docs/reference/messages/client/no-derp-connection) — The client can't reach a DERP relay server. Check your internet, restart the client, or review firewall settings to restore connectivity.

* [Security update available](/docs/reference/messages/client/security-update-available) — Notification of a Tailscale security update. To stay secure, install the update promptly using the client UI, app store, or CLI.

* [Tailscale blocked by Screen Time](/docs/reference/messages/client/screen-time-controlclient) — macOS Screen Time is blocking Tailscale. Disable the restriction in System Settings to restore proper client functionality.

* [Tailscale SSH and SELinux](/docs/reference/messages/client/ssh-unavailable-selinux-enabled) — SELinux is enforcing security rules that may block Tailscale's built-in SSH, since it runs inside the tailscaled process instead of the system SSH daemon.

* [Update available](/docs/reference/messages/client/update-available) — Notification of a new Tailscale version. Update using the client UI, app store, or CLI to get the latest features and improvements.

* [Using an unstable version](/docs/reference/messages/client/using-unstable-version) — Unstable Tailscale versions are for testing. They're safe if intentional, but not recommended for production use.

* [Windows network configuration failed](/docs/reference/messages/client/set-network-category-failed) — The Tailscale client failed to set required Windows network settings for its adapter, which can block routing, DNS, or overall connectivity.