Ziggo Blocking OpenVPN Ports

[juniormnunes]

Hi all!

Is someone else out there having issues to connect to OpenVPN?

From about a month ago my internet stopped allowing connection to OpenVPN. OpenVPN however works normally if i am connecting using my phone as a hot spot.

$computer = "ras.tcxn.net"
$ports = 1..65535
foreach ($port in $ports) {
$result = Test-NetConnection -ComputerName $computer -Port $port -WarningAction SilentlyContinue
if ($result.TcpTestSucceeded) {
Write-Output "Port $port is open"
}
}

I have ran a scan and no ports are allowed. Originally OpenVPN uses 1194 for UDP and 443 for TCP connection, but none of them seem to work.

I have also checked the configuration in the modem's page, but nothing seem to work, the port forwarding / filtering are useless in this sense.

Is someone having the same issue and able to share  any solution? Customer Support couldn't do much as well.

Thanks you all!

[Steefb]

Ziggo does not block unless legaly required.

[Karel.]

Maybe your Ziggo WAN ip address is blacklisted by tcxn.net. Ask them to whitelist you.

Scanning all ports of an computer that is not yours can be considered supsicious and they can block you totally as a result.

[tobiastheebe · Accepted solution]

Verify with the VPN server provider whether connection attempts from your external IPv4 address are being blocked. I can reach the server from my Ziggo connection:

Test-NetConnection -ComputerName ras.tcxn.net -Port 1194

ComputerName     : ras.tcxn.net
RemoteAddress    : 188.92.172.42
RemotePort       : 1194
InterfaceAlias   : Ethernet
SourceAddress    : 192.168.1.101
TcpTestSucceeded : True

[juniormnunes]

Hey, mate!

Test-NetConnection -ComputerName ras.tcxn.net -Port 1194 WARNING: TCP connect to (188.92.172.42 : 1194) failed
ComputerName : ras.tcxn.net
RemoteAddress : 188.92.172.42
RemotePort : 1194
InterfaceAlias : Wi-Fi
SourceAddress : 192.168.178.236
PingSucceeded : True
PingReplyDetails (RTT) : 35 ms
TcpTestSucceeded : False

That's not happening here. However i managed to fix the problem: port 992 is open for TCP connection. All good now.

It's weird that i'm being blocked and you are not. But sorted anyways.

[juniormnunes]

Hi!

It happened that only port 992 is open for openVPN. All fixed now.