Is port 81 (HTTP Alternate) dangerous?

Port 81 is classified as medium risk. It is commonly exposed but consider using encrypted alternatives where available and monitor activity.

Should port 81 be open on my firewall?

Port 81 can be open but should be monitored closely. Keep the service updated and prefer encrypted alternatives where available.

What transport protocol does port 81 use?

Port 81 (HTTP Alternate) uses the TCP transport protocol and falls under the Web category.

:81 (TCP)

HTTP Alternate

Medium Risiko

TCP — Web

Ikhtisar Port

Nomor Port 81

Nama Layanan HTTP Alternate

Protokol Transport TCP

Kategori Web

Risiko Keamanan Medium

Rentang Port Well-Known (0-1023)

Apa itu Port 81?

Port 81 is an unofficial alternate HTTP port used when port 80 is unavailable or blocked, commonly seen on home routers, development servers, and some commercial web appliances. Publicly exposed port 81 web services are frequently targeted by automated vulnerability scanners.

TCP Web Umum Digunakan

Pertimbangan Keamanan

Port 81 (HTTP Alternate) diklasifikasikan sebagai risiko sedang. Meskipun layanan ini umumnya diekspos, pertimbangkan untuk menggunakan alternatif terenkripsi jika tersedia.

Rekomendasi: Jaga layanan tetap diperbarui. Pantau log untuk aktivitas yang tidak biasa.

Port Terkait — Web

70 Gopher 80 HTTP 280 http-mgmt 414 InfoSeek 418 Hyper-G 443 HTTPS 454 ContentServer 593 HTTP-RPC-EPMAP

Istilah Terkait

ARP FTP HTTP ICMP IMAP NTP