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// File transfer & sharing

Port 9802: WebDAV Source TLS/SSL

Port 9802 is assigned by IANA to davsrcs (WebDAV Source TLS/SSL).

9802

How davsrcs works

File transfer & sharing
client:98021/32/33/3davsrcs? client:98021/32/33/3davsrcs?

Files are sent over port 9802 in pieces and reassembled on the other side. 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
Assigned1 registered service
Range
Registered (1024-49151)
Category
File transfer & sharing
01 Security

Is port 9802 dangerous?

We have no specific security note for port 9802. Its risk depends on the program actually listening on it. General advice for file transfer & sharing services:

  • Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).
  • Disable anonymous access and restrict shares or exports to known hosts.
  • Never publish file sharing protocols to the Internet.
02 Registry

IANA registry entries for port 9802

ServicePortTransportDescriptionReferenceUpdated
davsrcs 9802 TCP, UDP WebDAV Source TLS/SSL - 2003-07

// source: IANA service name and port number registry

03 Check it

Which program uses port 9802, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9802'      # process listening on 9802
sudo lsof -nP -i :9802

macOS

sudo lsof -nP -i :9802

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9802 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9802
netstat -ano | findstr :9802

From another machine

nmap -p 9802 -sV <host>
sudo nmap -sU -p 9802 <host>
nc -zv <host> 9802

Block it in the firewall

sudo ufw deny 9802/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9802" -Direction Inbound -LocalPort 9802 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9802 used for?

Port 9802 is assigned by IANA to davsrcs (WebDAV Source TLS/SSL).

Is port 9802 TCP or UDP?

Port 9802 is registered for TCP and UDP.

Is it safe to open port 9802?

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. Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).

How do I check if port 9802 is open?

On Linux run "ss -ltnup 'sport = :9802'", on macOS "lsof -nP -i :9802", and on Windows "netstat -ano | findstr :9802" to see the local process. From another machine, "nmap -p 9802 <host>" shows whether it is reachable.

05 Related
:445 SMB tcp · udp · critical risk :21 FTP tcp · udp · sctp · high risk :139 NetBIOS Session tcp · udp · high risk :69 TFTP udp · tcp · high risk :2049 NFS tcp · udp · sctp · high risk :873 rsync tcp · udp · high risk :20 File Transfer [Default Data] tcp · udp · sctp :115 Simple File Transfer Protocol tcp · udp

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