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KPN is increasingly enabling "Safe Internet" on existing internet connections. As a result, ports that most consumers do not use are blocked by KPN. This may block FTP traffic (File Transfer Protocol, port 21) as well as unsecured email ports (587, 110, and 143).

For email, we recommend always using the SSL version of the mail server. Port 587 becomes 465, port 110 becomes 995, and port 143 becomes 993. Please note that you must also change the security method in your email program from None or TLS to SSL.

To restore FTP functionality, you can use the KPN guide below. We've outlined the steps here:

• Log in to your Experia Box modem.
• Go to the Security section.
• Change the firewall security level from the default setting Medium to Custom.
• Set the main switch next to Block Everything to Allow Everything.
• Change the TCP 20–21 FTP slider from On to Off (move it to the left).
• You will now have the same settings as the Medium firewall security level, with the only difference being that the outgoing FTP block has been removed.

Full guide:
https://community.kpn.com/kennisbank-modem-instellingen-171/modems-met-kpn-software-firewall-instellingen-614868

If you have any further questions or need additional assistance, please don't hesitate to contact us.

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