ConnectBox3 - TCP Port 443 Blocked

HBB462 · 2025-05-14T09:29:19+00:00

Squadra, buongiorno, Ho problemi per connettermi al mio server Webmail di Outlook W. Il mio laptop di lavoro. Posso connettermi a Internet ma le prospettive rimangono offline (tramite cavo LAN o WiFi). Sembra che la porta TCP 443 sia bloccata e non posso usarla. Ho un modem ConnectBox3, che funziona perfettamente w. Altri dispositivi. Grazie, Hb

HBB462

Team, good morning,

I’m having issues to connect to my Outlook webmail server w. my work laptop. I can connect to the internet but the Outlook remains offline (either via LAN cable or WiFi). It seems that the TCP Port 443 is blocked, and I cannot use it. I have a ConnectBox3 modem, which works perfectly w. other devices.

Thanks,

Xydocq

hello HBB462

The Connect Box 3 FIBRE should not block any outgoing ports.

One thing you can look into, is your connection running on IPv6 or IPv4? To do so, log in to your Connect Box 3 and have a look at Admin > Information it should tell you, if you get a public IPv6 or IPv4 address.

If it states IPv6, you might want to call 0800 707 707 and request a switch to IPv4. This might solve the issue.

Would be nice to hear, if your problem got solved.

HBB462

Xydocq, Team,
I haven’t tested the option of switching to IPv4 yet, as I’m indeed running IPv6. Will have a check w. my HelpDesk prior doing it.
In the meantime, a few corrections and further details:
- It’s a ConnectBox3 Non-Fiber
- My business laptop runs the Palo Alto Global Protect VPN
- The laptop connects just fine to the network, establishes a secure connect via the VPN and I manage to use the internet, intranet and even access sharepoints
- The “only” connection that doesn’t properly work is Outlook. It seems to connect to the server for a few seconds and then loses connection. No email downloads/uploads for hours. Sometimes if I disconnect/reconnect the network, it works for a few minutes, and then again it loses connection.

Any other idea?

Thanks!