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macOS and Linux both return EPERM when sendto(2) is blocked by the firewall. Sometimes these blocks and transient, in the case of a fault between EDR software and a kernel, and at other times this may be a persistent state. Report a health warning for the state, and rebind only up to once every 15m in order to avoid excess workload. Updates #11710 Updates #12891 Updates #13511 Signed-off-by: James Tucker <james@tailscale.com>