No access to remote PHD2 server

[Kim Janny]

I tried to access the remote PHD2 server running on Raspberry Pi inside the same private network(192.168.11.5 for RPi and 192.168.11.6 for my desktop). I turned off both firewall on the server and the desktop. So there is no firewall between the server and my desktop. I tested with telnet and I can see event data coming from PHD2. I cannot find any network issues between them.

I tested this with N.I.N.A 3.1 HF1 but N.I.N.A just complained “No such host is known.”

This is the trace log.

2024-07-08T20:23:36.2246|ERROR|GuiderVM.cs|Connect|259
System.Net.Sockets.SocketException (0x00002AF9): No such host is known.
at System.Net.Dns.GetHostEntryOrAddressesCore(IPAddress address, Boolean justAddresses, AddressFamily addressFamily, Nullable`1 startingTimestamp)
at System.Net.Dns.GetHostEntry(String hostNameOrAddress, AddressFamily family)
at NINA.Equipment.Equipment.MyGuider.PHD2.PHD2Guider.Connect(CancellationToken token) in C:\Projects\nina\NINA.Equipment\Equipment\MyGuider\PHD2\PHD2Guider.cs:line 184
at NINA.WPF.Base.ViewModel.Equipment.Guider.GuiderVM.Connect() in C:\Projects\nina\NINA.WPF.Base\ViewModel\Equipment\Guider\GuiderVM.cs:line 222

[Stefan B]

Please check your firewall settings. I just tried it on two machines where i connected to phd2 over network without a problem.

[Kim Janny]

As I mentioned, firewall is already off. Please see the screenshot. I can access the PHD2 server with putty using telnet protocol. But NINA can’t.

[Kim Janny]

This is the current firewall setting. They are off. Of course the firewall of server side is also off because I can access PHD2 with telnet.

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[Kim Janny]

I think I found reason for this error. If I use an ipaddress which doesn’t have a hostname, Dns.GetHostEntry throws an exception. I think you should try something like this.

        try {
            var hostEntry = Dns.GetHostEntry(profileService.ActiveProfile.GuiderSettings.PHD2ServerUrl);
            phd2Ip = hostEntry.AddressList.First(x => x.AddressFamily == AddressFamily.InterNetwork);
        } catch (SocketException ex) {
            if (ex.ErrorCode == 11001)
                phd2Ip = IPAddress.Parse(profileService.ActiveProfile.GuiderSettings.PHD2ServerUrl);
            else
                throw new SocketException(ex.ErrorCode, ex.Message);
        }

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