Well-known · Windows

593 HTTP RPC Ep Map

TCP Yes
UDP Yes
SCTP —
DCCP —

What it is

DCE/RPC endpoint mapper over HTTP (RPC-over-HTTP).

When / why

Exchange/Outlook Anywhere style RPC. Internal use only.

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.
« 591 FileMaker Web 601 Reliable Syslog »

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 593

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 593

Allow TCP 593 (HTTP RPC Ep Map). Replace <source> with the network/host that should reach it.

sudo ufw allow proto udp from <source> to any port 593

Allow UDP 593 (HTTP RPC Ep Map). 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="593" protocol="tcp" accept'

Allow TCP 593 (HTTP RPC Ep Map) from <source>. Run 'firewall-cmd --reload' afterwards.

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="593" protocol="udp" accept'

Allow UDP 593 (HTTP RPC Ep Map) from <source>. Run 'firewall-cmd --reload' afterwards.

nftables

nft add rule inet filter input ip saddr <source> tcp dport 593 accept

Allow TCP 593 (HTTP RPC Ep Map). Assumes table 'inet filter' with an 'input' chain.

nft add rule inet filter input ip saddr <source> udp dport 593 accept

Allow UDP 593 (HTTP RPC Ep Map). Assumes table 'inet filter' with an 'input' chain.

iptables

sudo iptables -A INPUT -p tcp -s <source> --dport 593 -j ACCEPT

Allow TCP 593 (HTTP RPC Ep Map). Persist with iptables-save/netfilter-persistent.

sudo iptables -A INPUT -p udp -s <source> --dport 593 -j ACCEPT

Allow UDP 593 (HTTP RPC Ep Map). Persist with iptables-save/netfilter-persistent.

Azure NSG

az network nsg rule create -g <resource-group> --nsg-name <nsg> -n Allow-httprpcepmap-593 --priority 1000 --access Allow --direction Inbound --protocol "*" --source-address-prefixes <source> --destination-port-ranges 593

Inbound rule for 593 (HTTP RPC Ep Map). 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=593,ToPort=593,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound TCP 593 (HTTP RPC Ep Map). 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=593,ToPort=593,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound UDP 593 (HTTP RPC Ep Map). Replace <source-cidr> (e.g. 10.0.0.0/16).

GCP firewall

gcloud compute firewall-rules create allow-httprpcepmap-593 --direction=INGRESS --action=ALLOW --rules=tcp:593,udp:593 --source-ranges=<source-cidr> --network=<network>

Ingress rule for 593 (HTTP RPC Ep Map). Scope with --source-ranges and optionally --target-tags.

Windows netsh

netsh advfirewall firewall add rule name="Allow HTTP RPC Ep Map 593/TCP" dir=in action=allow protocol=TCP localport=593 remoteip=<source>

Inbound TCP 593 (HTTP RPC Ep Map). Set remoteip to a host/subnet; 'any' is discouraged.

netsh advfirewall firewall add rule name="Allow HTTP RPC Ep Map 593/UDP" dir=in action=allow protocol=UDP localport=593 remoteip=<source>

Inbound UDP 593 (HTTP RPC Ep Map). Set remoteip to a host/subnet; 'any' is discouraged.

Windows PowerShell

New-NetFirewallRule -DisplayName "Allow HTTP RPC Ep Map 593/TCP" -Direction Inbound -Action Allow -Protocol TCP -LocalPort 593 -RemoteAddress <source>

Inbound TCP 593 (HTTP RPC Ep Map). Replace <source> with a host or subnet.

New-NetFirewallRule -DisplayName "Allow HTTP RPC Ep Map 593/UDP" -Direction Inbound -Action Allow -Protocol UDP -LocalPort 593 -RemoteAddress <source>

Inbound UDP 593 (HTTP RPC Ep Map). 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.