- 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 6601: Microsoft Threat Management Gateway SSTP
Port 6601 is assigned by IANA to mstmg-sstp (Microsoft Threat Management Gateway SSTP).
6601
How mstmg-sstp works
Other servicesThe client sends a request to port 6601 and the mstmg-sstp service answers.
- Transport
- TCP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned1 registered service
- Range
- Registered (1024-49151)
- Category
- Other services
Is port 6601 dangerous?
We have no specific security note for port 6601. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 6601
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| mstmg-sstp | 6601 | TCP | Microsoft Threat Management Gateway SSTP | - | 2009-05-04 |
| - | 6601 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 6601, and is it reachable?
Linux
sudo ss -ltnup 'sport = :6601' # process listening on 6601
sudo lsof -nP -i :6601macOS
sudo lsof -nP -i :6601
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6601 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 6601 netstat -ano | findstr :6601
From another machine
nmap -p 6601 -sV <host> nc -zv <host> 6601
Block it in the firewall
sudo ufw deny 6601/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 6601" -Direction Inbound -LocalPort 6601 -Protocol TCP -Action Block # Windows
What is port 6601 used for?
Port 6601 is assigned by IANA to mstmg-sstp (Microsoft Threat Management Gateway SSTP).
Is port 6601 TCP or UDP?
Port 6601 is registered for TCP.
Is it safe to open port 6601?
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 6601 is open?
On Linux run "ss -ltnup 'sport = :6601'", on macOS "lsof -nP -i :6601", and on Windows "netstat -ano | findstr :6601" to see the local process. From another machine, "nmap -p 6601 <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