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// Other services

Port 8276: Microsoft Connected Cache

Port 8276 is assigned by IANA to ms-mcc (Microsoft Connected Cache).

8276

How ms-mcc works

Other services
client:8276ms-mccresponse client:8276ms-mccresponse

The client sends a request to port 8276 and the ms-mcc 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 8276 dangerous?

We have no specific security note for port 8276. 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 8276

ServicePortTransportDescriptionReferenceUpdated
ms-mcc 8276 TCP, UDP Microsoft Connected Cache - 2022-05-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 8276, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8276'      # process listening on 8276
sudo lsof -nP -i :8276

macOS

sudo lsof -nP -i :8276

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8276 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8276
netstat -ano | findstr :8276

From another machine

nmap -p 8276 -sV <host>
sudo nmap -sU -p 8276 <host>
nc -zv <host> 8276

Block it in the firewall

sudo ufw deny 8276/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8276" -Direction Inbound -LocalPort 8276 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8276 used for?

Port 8276 is assigned by IANA to ms-mcc (Microsoft Connected Cache).

Is port 8276 TCP or UDP?

Port 8276 is registered for TCP and UDP.

Is it safe to open port 8276?

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 8276 is open?

On Linux run "ss -ltnup 'sport = :8276'", on macOS "lsof -nP -i :8276", and on Windows "netstat -ano | findstr :8276" to see the local process. From another machine, "nmap -p 8276 <host>" shows whether it is reachable.

05 Related
: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

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