Is port 139 (NetBIOS Session) dangerous?

Port 139 is classified as high risk. It is a common target for automated scanning and brute-force attacks. Restrict access to trusted IPs if exposure is necessary.

Should port 139 be open on my firewall?

Port 139 should only be open with strict firewall rules whitelisting trusted IP addresses. Enable rate limiting and intrusion detection systems.

What transport protocol does port 139 use?

Port 139 (NetBIOS Session) uses the TCP transport protocol and falls under the File Transfer category.

:139 (TCP)

NetBIOS Session

High Risiko

TCP — File Transfer

On this page

Ikhtisar Port

Nomor Port 139

Nama Layanan NetBIOS Session

Protokol Transport TCP

Kategori File Transfer

Risiko Keamanan High

Rentang Port Well-Known (0-1023)

Apa itu Port 139?

NetBIOS Session Service. Establishes sessions for file and printer sharing on legacy Windows networks (SMB over NetBIOS). Replaced by direct SMB on port 445.

TCP File Transfer Umum Digunakan

Pertimbangan Keamanan

Port 139 (NetBIOS Session) diklasifikasikan sebagai risiko tinggi. Port ini adalah target umum untuk pemindaian otomatis dan serangan brute-force. Jika harus diekspos, batasi akses ke alamat IP yang diketahui.

Rekomendasi: Gunakan aturan firewall untuk memasukkan IP tepercaya ke whitelist. Aktifkan pembatasan kecepatan dan deteksi intrusi.

NetBIOS Session

Ikhtisar Port

Apa itu Port 139?

Pertimbangan Keamanan

Port Terkait — File Transfer

Istilah Terkait