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// Other services

Port 1138: encrypted admin requests

Port 1138 is assigned by IANA to encrypted_admin (encrypted admin requests), encrypted-admin (encrypted admin requests IANA assigned this well-formed service name as a replacement for "encrypted_admin".).

1138

How encrypted_admin works

Other services
client:1138#%&@!x9response? client:1138#%&@!x9response?

The client sends a request to port 1138 and the encrypted_admin service answers. Everything is encrypted: someone on the path only sees unreadable bytes.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
EncryptedTLS or built-in crypto
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1138 dangerous?

We have no specific security note for port 1138. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1138

ServicePortTransportDescriptionReferenceUpdated
encrypted_admin 1138 TCP, UDP encrypted admin requests - 2007-01
encrypted-admin 1138 TCP, UDP encrypted admin requests IANA assigned this well-formed service name as a replacement for "encrypted_admin". - 2007-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 1138, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1138'      # process listening on 1138
sudo lsof -nP -i :1138

macOS

sudo lsof -nP -i :1138

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1138 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1138
netstat -ano | findstr :1138

From another machine

nmap -p 1138 -sV <host>
sudo nmap -sU -p 1138 <host>
nc -zv <host> 1138

Block it in the firewall

sudo ufw deny 1138/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1138" -Direction Inbound -LocalPort 1138 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1138 used for?

Port 1138 is assigned by IANA to encrypted_admin (encrypted admin requests), encrypted-admin (encrypted admin requests IANA assigned this well-formed service name as a replacement for "encrypted_admin".).

Is port 1138 TCP or UDP?

Port 1138 is registered for TCP and UDP.

Is it safe to open port 1138?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 1138 is open?

On Linux run "ss -ltnup 'sport = :1138'", on macOS "lsof -nP -i :1138", and on Windows "netstat -ano | findstr :1138" to see the local process. From another machine, "nmap -p 1138 <host>" shows whether it is reachable.

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