Well-known · Linux/Unix

111 ONC RPC / portmapper

TCP Yes
UDP Yes
SCTP —
DCCP —

What it is

Sun RPC portmapper/rpcbind — maps RPC program numbers to ports.

When / why

Required by NFS and related services on Unix. A common attack surface; restrict it.

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.
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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 111

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 111

Allow TCP 111 (ONC RPC / portmapper). Replace <source> with the network/host that should reach it.

sudo ufw allow proto udp from <source> to any port 111

Allow UDP 111 (ONC RPC / portmapper). 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="111" protocol="tcp" accept'

Allow TCP 111 (ONC RPC / portmapper) from <source>. Run 'firewall-cmd --reload' afterwards.

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="111" protocol="udp" accept'

Allow UDP 111 (ONC RPC / portmapper) from <source>. Run 'firewall-cmd --reload' afterwards.

nftables

nft add rule inet filter input ip saddr <source> tcp dport 111 accept

Allow TCP 111 (ONC RPC / portmapper). Assumes table 'inet filter' with an 'input' chain.

nft add rule inet filter input ip saddr <source> udp dport 111 accept

Allow UDP 111 (ONC RPC / portmapper). Assumes table 'inet filter' with an 'input' chain.

iptables

sudo iptables -A INPUT -p tcp -s <source> --dport 111 -j ACCEPT

Allow TCP 111 (ONC RPC / portmapper). Persist with iptables-save/netfilter-persistent.

sudo iptables -A INPUT -p udp -s <source> --dport 111 -j ACCEPT

Allow UDP 111 (ONC RPC / portmapper). Persist with iptables-save/netfilter-persistent.

Azure NSG

az network nsg rule create -g <resource-group> --nsg-name <nsg> -n Allow-oncrpcportmapper-111 --priority 1000 --access Allow --direction Inbound --protocol "*" --source-address-prefixes <source> --destination-port-ranges 111

Inbound rule for 111 (ONC RPC / portmapper). 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=111,ToPort=111,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound TCP 111 (ONC RPC / portmapper). 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=111,ToPort=111,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound UDP 111 (ONC RPC / portmapper). Replace <source-cidr> (e.g. 10.0.0.0/16).

GCP firewall

gcloud compute firewall-rules create allow-oncrpcportmapper-111 --direction=INGRESS --action=ALLOW --rules=tcp:111,udp:111 --source-ranges=<source-cidr> --network=<network>

Ingress rule for 111 (ONC RPC / portmapper). Scope with --source-ranges and optionally --target-tags.

Windows netsh

netsh advfirewall firewall add rule name="Allow ONC RPC / portmapper 111/TCP" dir=in action=allow protocol=TCP localport=111 remoteip=<source>

Inbound TCP 111 (ONC RPC / portmapper). Set remoteip to a host/subnet; 'any' is discouraged.

netsh advfirewall firewall add rule name="Allow ONC RPC / portmapper 111/UDP" dir=in action=allow protocol=UDP localport=111 remoteip=<source>

Inbound UDP 111 (ONC RPC / portmapper). Set remoteip to a host/subnet; 'any' is discouraged.

Windows PowerShell

New-NetFirewallRule -DisplayName "Allow ONC RPC / portmapper 111/TCP" -Direction Inbound -Action Allow -Protocol TCP -LocalPort 111 -RemoteAddress <source>

Inbound TCP 111 (ONC RPC / portmapper). Replace <source> with a host or subnet.

New-NetFirewallRule -DisplayName "Allow ONC RPC / portmapper 111/UDP" -Direction Inbound -Action Allow -Protocol UDP -LocalPort 111 -RemoteAddress <source>

Inbound UDP 111 (ONC RPC / portmapper). 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.