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// Other services

Port 3775: ISPM Manager Port

Port 3775 is assigned by IANA to ispmmgr (ISPM Manager Port).

3775

How ispmmgr works

Other services
client:3775ispmmgrresponse client:3775ispmmgrresponse

The client sends a request to port 3775 and the ispmmgr service answers.

Transport
TCP · UDP
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
01 Security

Is port 3775 dangerous?

We have no specific security note for port 3775. 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 3775

ServicePortTransportDescriptionReferenceUpdated
ispmmgr 3775 TCP, UDP ISPM Manager Port - 2003-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 3775, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3775'      # process listening on 3775
sudo lsof -nP -i :3775

macOS

sudo lsof -nP -i :3775

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3775 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3775
netstat -ano | findstr :3775

From another machine

nmap -p 3775 -sV <host>
sudo nmap -sU -p 3775 <host>
nc -zv <host> 3775

Block it in the firewall

sudo ufw deny 3775/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3775" -Direction Inbound -LocalPort 3775 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3775 used for?

Port 3775 is assigned by IANA to ispmmgr (ISPM Manager Port).

Is port 3775 TCP or UDP?

Port 3775 is registered for TCP and UDP.

Is it safe to open port 3775?

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 3775 is open?

On Linux run "ss -ltnup 'sport = :3775'", on macOS "lsof -nP -i :3775", and on Windows "netstat -ano | findstr :3775" to see the local process. From another machine, "nmap -p 3775 <host>" shows whether it is reachable.

05 Related
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