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// Databases & caches

Port 4950: Sybase Server Monitor

Port 4950 is assigned by IANA to sybasesrvmon (Sybase Server Monitor).

4950

How sybasesrvmon works

Databases & caches
app:4950sybasesrvmon app:4950sybasesrvmon

The application sends a SQL query to the sybasesrvmon server on port 4950, which returns rows from its tables.

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
Databases & caches
01 Security

Is port 4950 dangerous?

We have no specific security note for port 4950. Its risk depends on the program actually listening on it. General advice for databases & caches services:

  • Bind the service to localhost or a private network, never to a public address.
  • Enable authentication, use per-application accounts and require TLS.
  • Watch for exposed Docker ports: publish them on 127.0.0.1 only.
02 Registry

IANA registry entries for port 4950

ServicePortTransportDescriptionReferenceUpdated
sybasesrvmon 4950 TCP, UDP Sybase Server Monitor - 2008-03-26

// source: IANA service name and port number registry

03 Check it

Which program uses port 4950, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4950'      # process listening on 4950
sudo lsof -nP -i :4950

macOS

sudo lsof -nP -i :4950

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4950 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4950
netstat -ano | findstr :4950

From another machine

nmap -p 4950 -sV <host>
sudo nmap -sU -p 4950 <host>
nc -zv <host> 4950

Block it in the firewall

sudo ufw deny 4950/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4950" -Direction Inbound -LocalPort 4950 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4950 used for?

Port 4950 is assigned by IANA to sybasesrvmon (Sybase Server Monitor).

Is port 4950 TCP or UDP?

Port 4950 is registered for TCP and UDP.

Is it safe to open port 4950?

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. Bind the service to localhost or a private network, never to a public address.

How do I check if port 4950 is open?

On Linux run "ss -ltnup 'sport = :4950'", on macOS "lsof -nP -i :4950", and on Windows "netstat -ano | findstr :4950" to see the local process. From another machine, "nmap -p 4950 <host>" shows whether it is reachable.

05 Related
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