Registered · Cross-platform

12201 GELF (Graylog)

TCP Unofficial
UDP Unofficial
SCTP —
DCCP —

What it is

Graylog Extended Log Format input.

When / why

Structured log ingestion.

Protocol status detail

TransportStatusMeaning
TCP Unofficial Not assigned by IANA, but standardized, specified, or widely used on this port.
UDP Unofficial Not assigned by IANA, but standardized, specified, or widely used on this port.
SCTP — Not applicable for this transport.
DCCP — Not applicable for this transport.
« 11434 Ollama 12345 NetBus / Cube World »

Port range

Registered (1024–49151). Assigned by IANA on request; usable without elevated privileges on most systems.

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Firewall rules for port 12201

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 12201

Allow TCP 12201 (GELF (Graylog)). Replace <source> with the network/host that should reach it.

sudo ufw allow proto udp from <source> to any port 12201

Allow UDP 12201 (GELF (Graylog)). 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="12201" protocol="tcp" accept'

Allow TCP 12201 (GELF (Graylog)) from <source>. Run 'firewall-cmd --reload' afterwards.

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="12201" protocol="udp" accept'

Allow UDP 12201 (GELF (Graylog)) from <source>. Run 'firewall-cmd --reload' afterwards.

nftables

nft add rule inet filter input ip saddr <source> tcp dport 12201 accept

Allow TCP 12201 (GELF (Graylog)). Assumes table 'inet filter' with an 'input' chain.

nft add rule inet filter input ip saddr <source> udp dport 12201 accept

Allow UDP 12201 (GELF (Graylog)). Assumes table 'inet filter' with an 'input' chain.

iptables

sudo iptables -A INPUT -p tcp -s <source> --dport 12201 -j ACCEPT

Allow TCP 12201 (GELF (Graylog)). Persist with iptables-save/netfilter-persistent.

sudo iptables -A INPUT -p udp -s <source> --dport 12201 -j ACCEPT

Allow UDP 12201 (GELF (Graylog)). Persist with iptables-save/netfilter-persistent.

Azure NSG

az network nsg rule create -g <resource-group> --nsg-name <nsg> -n Allow-gelfgraylog-12201 --priority 1000 --access Allow --direction Inbound --protocol "*" --source-address-prefixes <source> --destination-port-ranges 12201

Inbound rule for 12201 (GELF (Graylog)). 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=12201,ToPort=12201,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound TCP 12201 (GELF (Graylog)). 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=12201,ToPort=12201,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound UDP 12201 (GELF (Graylog)). Replace <source-cidr> (e.g. 10.0.0.0/16).

GCP firewall

gcloud compute firewall-rules create allow-gelfgraylog-12201 --direction=INGRESS --action=ALLOW --rules=tcp:12201,udp:12201 --source-ranges=<source-cidr> --network=<network>

Ingress rule for 12201 (GELF (Graylog)). Scope with --source-ranges and optionally --target-tags.

Windows netsh

netsh advfirewall firewall add rule name="Allow GELF (Graylog) 12201/TCP" dir=in action=allow protocol=TCP localport=12201 remoteip=<source>

Inbound TCP 12201 (GELF (Graylog)). Set remoteip to a host/subnet; 'any' is discouraged.

netsh advfirewall firewall add rule name="Allow GELF (Graylog) 12201/UDP" dir=in action=allow protocol=UDP localport=12201 remoteip=<source>

Inbound UDP 12201 (GELF (Graylog)). Set remoteip to a host/subnet; 'any' is discouraged.

Windows PowerShell

New-NetFirewallRule -DisplayName "Allow GELF (Graylog) 12201/TCP" -Direction Inbound -Action Allow -Protocol TCP -LocalPort 12201 -RemoteAddress <source>

Inbound TCP 12201 (GELF (Graylog)). Replace <source> with a host or subnet.

New-NetFirewallRule -DisplayName "Allow GELF (Graylog) 12201/UDP" -Direction Inbound -Action Allow -Protocol UDP -LocalPort 12201 -RemoteAddress <source>

Inbound UDP 12201 (GELF (Graylog)). 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.