- 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.
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 servicesThe 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
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:
IANA registry entries for port 1138
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| 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
Which program uses port 1138, and is it reachable?
Linux
sudo ss -ltnup 'sport = :1138' # process listening on 1138
sudo lsof -nP -i :1138macOS
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
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.
Other other services ports
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp