Is port 1645 (RADIUS Authentication (old)) dangerous?

Port 1645 is classified as medium risk. It is commonly exposed but consider using encrypted alternatives where available and monitor activity.

Should port 1645 be open on my firewall?

Port 1645 can be open but should be monitored closely. Keep the service updated and prefer encrypted alternatives where available.

What transport protocol does port 1645 use?

Port 1645 (RADIUS Authentication (old)) uses the UDP transport protocol and falls under the Security & VPN category.

:1645 (UDP)

RADIUS Authentication (old)

Medium 风险

UDP — Security & VPN

端口概览

端口号 1645

服务名称 RADIUS Authentication (old)

传输协议 UDP

类别 Security & VPN

安全风险 Medium

端口范围已注册 (1024-49151)

什么是端口 1645?

Port 1645 is an older, unofficial RADIUS authentication port used before the IANA officially assigned port 1812. Some legacy network devices and AAA servers still use this port for authentication. Network engineers managing older infrastructure may need to support both ports 1645 and 1812 simultaneously.

UDP Security & VPN

安全注意事项

端口1645（RADIUS Authentication (old)）被归类为中等风险。虽然此服务通常会暴露，但请在可用时考虑使用加密替代方案。

建议：保持服务更新。监控日志以发现异常活动。

RADIUS Authentication (old)

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端口概览

什么是端口 1645?

安全注意事项

相关端口 — Security & VPN

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