YouMonitServer + service monitoring — ports, TLS, SSH, mail, DNS.
Every service your infrastructure runs — TCP, UDP, SSH, SMTP, POP3, IMAP, NTP, DNS, ICMP ping — checked from 15+ regions with the exact protocol handshake, not just a port scan.
No credit card · Free plan forever · Cancel anytime
Real protocol handshakes — not "port is open"
A telnet succeeds when your SSH daemon returns 500 error. We do the actual protocol so silent failures don't hide.
TCP + UDP ports
Open the socket, optional send/expect strings. Alert on connection timeout, RST, or missing banner.
SSH banner
Detect when sshd stops responding or your fail2ban locks out the checker range.
SMTP / POP3 / IMAP
STARTTLS negotiation, HELO/EHLO handshake, greeting parse. Catch dead mail servers before customers do.
ICMP ping
Round-trip latency + packet loss. Baseline drift alerts on gradual network degradation.
NTP + DNS
Time drift and DNS resolution health — the boring foundations that break the loudest things when they fail.
DNS-change alerts
Alert when an A/AAAA/MX/NS record changes value — catch DNS hijacks, misconfigured deploys, expired hosting migrations.
Alerts anywhere your team lives
Route per monitor, per severity — production pages the on-call rota, marketing sites drop into a Slack channel.
Monitor the plumbing that keeps everything else running.
Free plan covers 10 services. No card required.
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