Well-known · Cross-platform

464 Kerberos kpasswd

TCP Yes
UDP Yes
SCTP —
DCCP —

What it is

Kerberos change/set password service.

When / why

Domain password changes; open to domain controllers on TCP and UDP.

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.
« 445 SMB / Microsoft-DS 465 SMTPS (submission) »

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 464

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 464

Allow TCP 464 (Kerberos kpasswd). Replace <source> with the network/host that should reach it.

sudo ufw allow proto udp from <source> to any port 464

Allow UDP 464 (Kerberos kpasswd). 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="464" protocol="tcp" accept'

Allow TCP 464 (Kerberos kpasswd) from <source>. Run 'firewall-cmd --reload' afterwards.

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="464" protocol="udp" accept'

Allow UDP 464 (Kerberos kpasswd) from <source>. Run 'firewall-cmd --reload' afterwards.

nftables

nft add rule inet filter input ip saddr <source> tcp dport 464 accept

Allow TCP 464 (Kerberos kpasswd). Assumes table 'inet filter' with an 'input' chain.

nft add rule inet filter input ip saddr <source> udp dport 464 accept

Allow UDP 464 (Kerberos kpasswd). Assumes table 'inet filter' with an 'input' chain.

iptables

sudo iptables -A INPUT -p tcp -s <source> --dport 464 -j ACCEPT

Allow TCP 464 (Kerberos kpasswd). Persist with iptables-save/netfilter-persistent.

sudo iptables -A INPUT -p udp -s <source> --dport 464 -j ACCEPT

Allow UDP 464 (Kerberos kpasswd). Persist with iptables-save/netfilter-persistent.

Azure NSG

az network nsg rule create -g <resource-group> --nsg-name <nsg> -n Allow-kerberoskpasswd-464 --priority 1000 --access Allow --direction Inbound --protocol "*" --source-address-prefixes <source> --destination-port-ranges 464

Inbound rule for 464 (Kerberos kpasswd). 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=464,ToPort=464,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound TCP 464 (Kerberos kpasswd). 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=464,ToPort=464,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound UDP 464 (Kerberos kpasswd). Replace <source-cidr> (e.g. 10.0.0.0/16).

GCP firewall

gcloud compute firewall-rules create allow-kerberoskpasswd-464 --direction=INGRESS --action=ALLOW --rules=tcp:464,udp:464 --source-ranges=<source-cidr> --network=<network>

Ingress rule for 464 (Kerberos kpasswd). Scope with --source-ranges and optionally --target-tags.

Windows netsh

netsh advfirewall firewall add rule name="Allow Kerberos kpasswd 464/TCP" dir=in action=allow protocol=TCP localport=464 remoteip=<source>

Inbound TCP 464 (Kerberos kpasswd). Set remoteip to a host/subnet; 'any' is discouraged.

netsh advfirewall firewall add rule name="Allow Kerberos kpasswd 464/UDP" dir=in action=allow protocol=UDP localport=464 remoteip=<source>

Inbound UDP 464 (Kerberos kpasswd). Set remoteip to a host/subnet; 'any' is discouraged.

Windows PowerShell

New-NetFirewallRule -DisplayName "Allow Kerberos kpasswd 464/TCP" -Direction Inbound -Action Allow -Protocol TCP -LocalPort 464 -RemoteAddress <source>

Inbound TCP 464 (Kerberos kpasswd). Replace <source> with a host or subnet.

New-NetFirewallRule -DisplayName "Allow Kerberos kpasswd 464/UDP" -Direction Inbound -Action Allow -Protocol UDP -LocalPort 464 -RemoteAddress <source>

Inbound UDP 464 (Kerberos kpasswd). 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.