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control/controlhttp: fix connectivity on Alaska Air wifi

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Updates #13597

Change-Id: Ifbf52b93fd35d64fcf80f8fddbfd610008fd8742
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-09-26 10:24:08 -07:00
committed by Brad Fitzpatrick
parent fd32f0ddf4
commit 1eaad7d3de
2 changed files with 31 additions and 0 deletions
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12
control/controlhttp/client.go
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@@ -272,6 +272,18 @@ func (d *Dialer) forceNoise443() bool {
if forceNoise443() {
return true
}
if d.HealthTracker.LastNoiseDialWasRecent() {
// If we dialed recently, assume there was a recent failure and fall
// back to HTTPS dials for the subsequent retries.
//
// This heuristic works around networks where port 80 is MITMed and
// appears to work for a bit post-Upgrade but then gets closed,
// such as seen in https://github.com/tailscale/tailscale/issues/13597.
d.logf("controlhttp: forcing port 443 dial due to recent noise dial")
return true
}
return false
}