Is port 12345 (NetBus / Custom Apps) dangerous?

Port 12345 is classified as critical risk and should not be exposed to the public internet. It transmits data without encryption, making it vulnerable to eavesdropping and credential theft.

Should port 12345 be open on my firewall?

No, port 12345 should not be open to the public internet. Block it at the firewall and use encrypted alternatives such as SSH, SFTP, or HTTPS instead.

What transport protocol does port 12345 use?

Port 12345 (NetBus / Custom Apps) uses the TCP/UDP transport protocol and falls under the Security & VPN category.

:12345 (TCP/UDP)

NetBus / Custom Apps

Critical Risk

TCP/UDP — Security & VPN

Port Overview

Port Number 12345

Service Name NetBus / Custom Apps

Transport Protocol TCP/UDP

Category Security & VPN

Security Risk Critical

Port Range Registered (1024-49151)

What is Port 12345?

Historically associated with NetBus, an early remote administration and trojan tool from the late 1990s. Still flagged as suspicious in security scans when found open unexpectedly. Also used by various custom and development applications.

TCP/UDP Security & VPN

Security Considerations

Port 12345 (NetBus / Custom Apps) is classified as critical risk. This port should not be exposed to the public internet. The service transmits data without encryption, making it vulnerable to eavesdropping, credential theft, and man-in-the-middle attacks.

Recommendation: Block this port at the firewall. Use encrypted alternatives (SSH, SFTP, HTTPS) instead.

Related Ports — Security & VPN

31 MSG-AUTH 48 Auditd 49 TACACS 56 XNS-AUTH 62 ACA Services 65 TACACS-DS 88 Kerberos 90 DNSIX Security

Related Terms

SSL/TLS Certificate DDoS DNS Spoofing Encryption Firewall HTTPS