Port 8443: HTTPS Alternate
HTTPS for admin panels and app servers. Plesk, UniFi and many appliances use it for admin. Restrict where possible.
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Port Lookup
Port 8443 at a glance
Port8443
ProtocolTCP
ServiceHTTPS Alternate
Open to the Internet?Only to addresses that need it
See What Is Listeningss -lntup | grep ':8443 '
Test From Outsidenc -zv your-server 8443
Block with UFWufw deny 8443/tcp
Block with nftablesnft add rule inet filter input tcp dport 8443 drop
HTTPS Alternate uses TCP port 8443. HTTPS for admin panels and app servers.
Plesk, UniFi and many appliances use it for admin. Restrict where possible.
Allow port 8443 only from the addresses that need it: your office, a VPN or a bastion host. The firewall rule generator builds those rules for nftables, iptables and UFW.
Other Ports
20 FTP Data21 FTP22 SSH23 Telnet25 SMTP53 DNS67 DHCP Server80 HTTP110 POP3123 NTP143 IMAP161 SNMP389 LDAP443 HTTPS445 SMB465 SMTPS514 Syslog587 Mail Submission853 DNS over TLS993 IMAPS995 POP3S1194 OpenVPN1433 Microsoft SQL Server1900 SSDP / UPnP2049 NFS2083 cPanel (SSL)2087 WHM (SSL)3306 MySQL / MariaDB3389 RDP3478 STUN / TURN5060 SIP5432 PostgreSQL5900 VNC6379 Redis8006 Proxmox VE8080 HTTP Alternate8443 HTTPS Alternate11211 Memcached25565 Minecraft27017 MongoDB51820 WireGuard
Questions
What is port 8443 used for?
HTTPS Alternate. HTTPS for admin panels and app servers.
Is it safe to open port 8443?
Only to addresses that need it. Plesk, UniFi and many appliances use it for admin. Restrict where possible.
How do I check if port 8443 is open?
On the server, ss -lntup | grep ':8443 ' shows what is listening. From another machine, nc -zv your-server 8443 shows whether the firewall lets it through.
How do I block port 8443?
With UFW: ufw deny 8443/tcp. With nftables, add a drop rule for dport 8443 in your input chain.
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