Adakalanya ketika kita pergi ke warnet, kita tidak bisa cek email melalui Outlook Express. Atau di warnet lainnya kita tidak bisa upload maupun download melalui FTP Client, padahal sehari sebelumnya kita masih bisa melakukan upload di warnet yang berbeda. Perlu Anda ketahui bahwa sebenarnya ketika kita melakukan hubungan dengan komputer lain, ada beberapa jalur khusus untuk tujuan tertentu. Jalur tersebut dinamakan port, ada beberapa ISP yang memang sengaja memblok atau menutup port tertentu sehingga beberapa aplikasi kita tidak berjalan sebagaimana mestinya.

Berikut kami sampaikan beberapa port yang berhubungan dengan hosting dan internet.

FTP : 21
telnet namadomainanda.com 21
220———- Welcome to Pure-FTPd [TLS] ———-
220-You are user number 1 of 50 allowed.
220-Local time is now 13:24. Server port: 21.
220-This is a private system - No anonymous login
220 You will be disconnected after 15 minutes of inactivity.

error:
Connecting To namadomainanda.com...Could not open connection to the host,
on port 21: Connect failed

——————————————————————————–

Webmail 2095
telnet namadomainanda.com 2095
HTTP/1.0 401 Access Denied Still Working
WWW-Authenticate: Basic realm=”WebMail”
Connection: close
Set-Cookie: webmailrelogin=no; path=/
Server: cpsrvd/10.9.6
Content-type: text/html

error:
Connecting To namadomainanda.com...Could not open connection to the host,
on port 2095: Connect failed

——————————————————————————–

cPanel 2082
telnet namadomainanda.com 2082
HTTP/1.0 401 Access Denied Still Working
WWW-Authenticate: Basic realm=”cPanel”
Connection: close
Set-Cookie: cprelogin=no; path=/
Server: cpsrvd/10.9.6
Content-type: text/html

error:
Connecting To namadomainanda.com...Could not open connection to the host,
on port 2082: Connect failed

——————————————————————————–

POP3 110
telnet namadomainanda.com 110
+OK POP3 eb2 [cppop 20.0] at [70.85.211.82]

error:
Connecting To namadomainanda.com...Could not open connection to the host,
on port 110: Connect failed

——————————————————————————–

SMTP 25
telnet namadomainanda.com 25
220-eb2.eebs.net ESMTP Exim 4.63 #1 Wed, 23 May 2007 13:41:53 -0500
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.

error:
Connecting To namadomainanda.com...Could not open connection to the host,
on port 25: Connect failed