iplocate Check Ports tool will serve for remotely verifying IP Address and detect Open Ports on connection.
|21 FTP||22 SSH||23 TELNET|
|25 SMTP||43 WHOIS||53 DNS|
|80 HTTP||110 POP3||115 SFTP|
|135 RCP||139 NetBIOS||143 IMAP|
|194 IRC||201 AppleTalk||389 LDAP|
|443 HTTPS||445 SMB||1194 OpenVPN|
|1433 MSSQL||3306 MySQL||3389 Remote Desktop|
|5631 PCAnywhere||5900 VNC||8080 HTTP Alternate|
This tool is usefull to check if your server application are blocked by a firewall or your ISP is blocking certain ports. Most ISP's block ports to combat viruses and spam. The most commonly blocked ports are port 80 and port 25.