What causes "check except:%r" in XX-net/XX-Net?

Check the %r exception detail in logs; single skips during scanning are normal

check except:%r

Error message

check except:%r

What it means

Checker thread caught an unexpected exception while calling check_ip(ip) for a candidate IP; the IP is skipped (continue) and the loop moves on. This guards the IP-scan loop from crashing.

Source

Thrown at code/default/gae_proxy/local/check_ip.py:136

                    continue

    def write_ip(self, ip, host, handshake):
        with self.lock:
            self.out_fd.write("%s %s gws %d 0 0\n" % (ip, host, handshake))
            self.out_fd.flush()

    def checker(self):
        while True:
            try:
                ip = self.get_ip()
            except Exception as e:
                xlog.info("no ip left")
                return

            try:
                res = self.check_ip.check_ip(ip)
            except Exception as e:
                xlog.warn("check except:%r", e)
                continue

            if not res or not res.ok:
                xlog.debug("ip:%s fail", ip)
                continue

            if res.h2:
                self.write_ip(ip, res.domain, res.handshake_time)

    def run(self):
        for i in range(0, 100):
            threading.Thread(target=self.checker, name="gae_ip_checker").start()


def check_all():
    check = CheckAllIp()
    check.run()
    exit(0)

View on GitHub (pinned to cfa5bc17b6)

Solutions

Check the %r exception detail in logs; single skips during scanning are normal
Update XX-Net for checker fixes
If every IP raises, investigate environment (openssl version, DNS) rather than the IPs
Sanitize custom IP ranges you add to the scan list

Defensive patterns

Strategy: try-catch

Try / catch

try:
    res = self.check_ip.check_ip(ip)
except Exception:
    continue  # skip this IP, keep scanning

Prevention

Wrap per-IP checks in try/except inside scan loops
Sanitize custom IP inputs
Update the checker with the app version

When it happens

Trigger: Any exception escaping check_ip beyond expected failures: DNS/socket edge cases, SSL errors, or coding bugs in the checker for malformed IPs.

Common situations: Odd network conditions during mass IP scanning, library incompatibilities, or malformed IP entries in the candidate list.

Related errors

AI-assisted analysis of XX-net/XX-Net@cfa5bc17b6 (2026-08-27). Data as JSON: /api/errors/2c31bd7399dc46ea. Report an issue: GitHub.