Well-known · Cross-platform

443 HTTPS / QUIC

TCP Yes
UDP Yes
SCTP —
DCCP —

What it is

HTTP over TLS (TCP) for HTTP/1.x and HTTP/2; HTTP/3 uses QUIC over UDP/443.

When / why

The dominant web port. Open both TCP and UDP if you serve HTTP/3.

Protocol status detail

TransportStatusMeaning
TCP Yes Assigned by IANA and standardized, specified, or widely used on this port.
UDP Yes Assigned by IANA and standardized, specified, or widely used on this port.
SCTP — Not applicable for this transport.
DCCP — Not applicable for this transport.
« 434 Mobile IP agent 444 SNPP »

Port range

Well-known (0–1023). System port for a core service. On Unix-like systems, binding it requires superuser privileges.

Browse all ports →

Firewall rules for port 443

Copy-ready inbound rules for the active transports. Replace every <source> placeholder with the specific host, subnet, or CIDR that should reach this port.

ufw

sudo ufw allow proto tcp from <source> to any port 443

Allow TCP 443 (HTTPS / QUIC). Replace <source> with the network/host that should reach it.

sudo ufw allow proto udp from <source> to any port 443

Allow UDP 443 (HTTPS / QUIC). Replace <source> with the network/host that should reach it.

firewalld

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="443" protocol="tcp" accept'

Allow TCP 443 (HTTPS / QUIC) from <source>. Run 'firewall-cmd --reload' afterwards.

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="443" protocol="udp" accept'

Allow UDP 443 (HTTPS / QUIC) from <source>. Run 'firewall-cmd --reload' afterwards.

nftables

nft add rule inet filter input ip saddr <source> tcp dport 443 accept

Allow TCP 443 (HTTPS / QUIC). Assumes table 'inet filter' with an 'input' chain.

nft add rule inet filter input ip saddr <source> udp dport 443 accept

Allow UDP 443 (HTTPS / QUIC). Assumes table 'inet filter' with an 'input' chain.

iptables

sudo iptables -A INPUT -p tcp -s <source> --dport 443 -j ACCEPT

Allow TCP 443 (HTTPS / QUIC). Persist with iptables-save/netfilter-persistent.

sudo iptables -A INPUT -p udp -s <source> --dport 443 -j ACCEPT

Allow UDP 443 (HTTPS / QUIC). Persist with iptables-save/netfilter-persistent.

Azure NSG

az network nsg rule create -g <resource-group> --nsg-name <nsg> -n Allow-httpsquic-443 --priority 1000 --access Allow --direction Inbound --protocol "*" --source-address-prefixes <source> --destination-port-ranges 443

Inbound rule for 443 (HTTPS / QUIC). Set <source> to a CIDR; lower priority number = higher precedence.

AWS Security Group

aws ec2 authorize-security-group-ingress --group-id <sg-id> --ip-permissions IpProtocol=tcp,FromPort=443,ToPort=443,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound TCP 443 (HTTPS / QUIC). Replace <source-cidr> (e.g. 10.0.0.0/16).

aws ec2 authorize-security-group-ingress --group-id <sg-id> --ip-permissions IpProtocol=udp,FromPort=443,ToPort=443,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound UDP 443 (HTTPS / QUIC). Replace <source-cidr> (e.g. 10.0.0.0/16).

GCP firewall

gcloud compute firewall-rules create allow-httpsquic-443 --direction=INGRESS --action=ALLOW --rules=tcp:443,udp:443 --source-ranges=<source-cidr> --network=<network>

Ingress rule for 443 (HTTPS / QUIC). Scope with --source-ranges and optionally --target-tags.

Windows netsh

netsh advfirewall firewall add rule name="Allow HTTPS / QUIC 443/TCP" dir=in action=allow protocol=TCP localport=443 remoteip=<source>

Inbound TCP 443 (HTTPS / QUIC). Set remoteip to a host/subnet; 'any' is discouraged.

netsh advfirewall firewall add rule name="Allow HTTPS / QUIC 443/UDP" dir=in action=allow protocol=UDP localport=443 remoteip=<source>

Inbound UDP 443 (HTTPS / QUIC). Set remoteip to a host/subnet; 'any' is discouraged.

Windows PowerShell

New-NetFirewallRule -DisplayName "Allow HTTPS / QUIC 443/TCP" -Direction Inbound -Action Allow -Protocol TCP -LocalPort 443 -RemoteAddress <source>

Inbound TCP 443 (HTTPS / QUIC). Replace <source> with a host or subnet.

New-NetFirewallRule -DisplayName "Allow HTTPS / QUIC 443/UDP" -Direction Inbound -Action Allow -Protocol UDP -LocalPort 443 -RemoteAddress <source>

Inbound UDP 443 (HTTPS / QUIC). Replace <source> with a host or subnet.

Rules are generated only for transports marked active for this port. They default to an inbound allow with an explicit source placeholder — never any. Review direction, scope, and rule precedence before applying in production.