How can I enable auto-reconnect on Kuailian lets after my Mac wakes from sleep?

Why Auto-Reconnect Matters on macOS

Auto-reconnect keeps your Kuailian privacy tool tunnel alive when a MacBook snaps out of sleep, preventing IP leaks and broken SSH sessions. Without it, every lid-open event forces a manual click—tedious for remote workers who hop between café Wi-Fi and office Ethernet. Over a year, those extra clicks add up to hours of lost focus.

The feature is buried inside the Kuailian client settings and behaves differently across subscription tiers. Free users get a basic ICMP ping retry, while Pro and Ultra unlock the proprietary K-Link UDP stealth protocol that re-establishes in under two seconds on empirical observation. Knowing which tier you need before you hit the road saves both time and frustration.

Plan Comparison: What Each Tier Unlocks

Free (650 MB daily)

Auto-reconnect uses standard Openprivacy tool-TCP with a 30-second retry interval. If the network drops packets during sleep, the client may hang until you toggle it off and on. Acceptable for occasional browsing, but video calls will stall and large downloads often restart from zero.

Pro (unlimited bandwidth)

Adds WireGuard and K-Link UDP. The latter disguises traffic as QUIC video, letting the handshake survive most captive portals you meet after sleep. Reconnect time averages two seconds on a 2023 M2 MacBook Air in empirical testing, making it the sweet spot for mobile professionals.

Ultra (multi-hop + dedicated IP)

Unlocks cascade mode: up to four nodes chained. Auto-reconnect rebuilds the entire chain in order, and the latency predictor shows per-hop RTT before committing. Useful for developers who SSH through a fixed US exit IP and cannot afford a new IP on every wake, or for compliance teams that whitelist a single address.

Decision Tree: Should You Upgrade?

Do you open your lid more than ten times a day? If yes, Pro saves roughly a minute of manual clicks daily—about six hours a year.
Do you rely on real-time apps (Zoom, Slack huddles) immediately after wake? K-Link UDP reduces freeze frames versus TCP.
Do you need the same exit IP after every reconnect? Only Ultra’s dedicated IP option guarantees that; otherwise you may rotate exits.

If none apply, stay on Free and tolerate occasional manual restarts. Example: a desktop Mac that stays plugged in and awake overnight rarely needs auto-reconnect at all.

Step-by-Step: Enable Auto-Reconnect on macOS

Desktop Client (Kuailian 2026)

Launch Kuailian ▸ top-right gear icon ▸ Preferences ▸ Network.
Tick “Reconnect on system wake from sleep.”
Choose protocol priority: K-Link UDP → WireGuard → Openprivacy tool UDP → TCP.
Set retry limit: 0 = infinite (recommended), or 3–5 if you prefer eventual timeout.
Click Apply; the setting survives app updates and macOS upgrades.

The daemon writes the plist to ~/Library/Preferences/app.kuailian.daemon.plist, so even a full reinstall retains your choice as long as you keep the home directory.

After enabling, the menu-bar icon shows a spinning arrow for ~2 s while reconnecting. If it stays yellow, open Console.app, filter for “kuailian-daemon,” and look for “klink0: handshake timeout” to confirm a captive portal is blocking UDP 443. A quick Safari splash page login usually clears the path.

Platform Differences & Fallbacks

macOS 13 Ventura vs 14 Sonoma

Ventura sometimes delays Wi-Fi driver initialization after sleep, causing the first K-Link handshake to fail. The client auto-falls back to WireGuard within five seconds. Sonoma resolves this; empirical observation shows 20 % faster reconnects on the same hardware. If you cannot upgrade, consider locking the client to WireGuard as the primary protocol.

Apple Silicon vs Intel

On M-series chips, the kernel extension loads before login, so auto-reconnect works at the login screen. Intel Macs require the user to log in first—plan accordingly if you run background cron jobs that need the tunnel. Example: a scheduled rsync script launched by launchd will fail on Intel until the user session starts.

Common Exceptions & How to Handle Them

Captive portals (hotels, airports) redirect HTTPS and break K-Link. Manually open Safari, complete the portal, then the client retries automatically.
USB-C Ethernet adapters that power down during sleep can leave the daemon with no interface. Use a powered dock or disable “Put hard disks to sleep” in Energy Saver.
Corporate proxies with TLS inspection drop WireGuard. Switch to Openprivacy tool-TCP and import the company’s root certificate under Preferences ▸ Advanced ▸ Custom Certs.

When in doubt, temporarily switch to TCP mode before boarding flights or entering high-security offices; the handshake is slower but rarely blocked.

Verification & Observation Methods

To confirm the setting works, close the lid for thirty seconds, reopen, and immediately ping 1.1.1.1. If the first ICMP leaves within three seconds, auto-reconnect succeeded. Longer gaps indicate fallback to TCP; check Console for “fallback reason: udp blocked.” For continuous monitoring, pipe the log into a file and review after a week of travel.

log stream --predicate 'process == "kuailian-daemon"' --level debug | grep -i reconnect

Run the above in Terminal to watch real-time reconnect events. Add --style json if you want to feed the output to a monitoring dashboard.

Best-Practice Checklist

Keep Kuailian in Login Items so the daemon starts before any user app needs DNS.
Enable “Always-on firewall” to block IPv6 and LAN leaks while the tunnel re-establishes.
Set DNS-over-HTTPS (NextDNS) inside Kuailian to avoid captive-DNS hijacks during reconnect.
Once a month, export diagnostics (Help ▸ Export Logs) and check for repeated “kex timeout” lines—an early sign that your favorite exit node is overloaded.

Following these four steps reduces support tickets to near zero and keeps your connection invisible to both trackers and overly curious network admins.

Frequently Asked Questions

Does auto-reconnect consume extra battery?

Empirical observation shows a 2–3 % increase in sleep power draw because the daemon keeps a UDP socket open. Disable the feature before long flights if you need maximum standby time.

The gray icon means no network interface is up yet. Wait five seconds; if it remains gray, open Network Preferences and verify Wi-Fi is connected. Kuailian will retry automatically once the interface gets an IP.

Can I use auto-reconnect with a dedicated IP on multiple Macs?

No. Kuailian binds the dedicated IP to one device at a time. Running it on a second Mac will kick the first offline. Use Pro or Free tiers on additional machines.

Closing Recommendation

If you open and close your MacBook more than a few times a day, upgrade to Kuailian Pro, enable “Reconnect on system wake,” and set K-Link UDP as the first protocol. The two-second reconnect keeps SSH tunnels, Zoom calls, and Spotify streams alive without finger gymnastics. Stay on Free only if you can tolerate occasional manual restarts and slower TCP fallbacks. Future client builds may introduce predictive server selection based on historical wake locations, but until then, the current toolkit is already the fastest way to stay seamlessly encrypted from lid-open to lid-close.