0

I am writing a program in my computer science class and I have come across an error when trying to obtain the public IPv4 address of the computer.

This is my code:

Private Function GetMyIP() As Net.IPAddress Using wc As New Net.WebClient Return Net.IPAddress.Parse(Encoding.ASCII.GetString(wc.DownloadData("http://tools.feron.it/php/ip.php"))) End Using End Function

This is then called using this code:

tboxPublicIPv4.Text = GetMyIP().ToString

However, when it tries to write the IPv4 address to the textbox I get this error:

An unhandled exception of type 'System.Net.WebException' occurred in System.dll Additional information: The request was aborted: Could not create SSL/TLS secure channel.

Any help would be appreciated. Thank you.

Improve this question

1 Answer 1

Reset to default
1

The URL you're calling is redirecting to https, and it seems at least TLS 1.1 is required.

You can enable TLS 1.1 or TLS 1.2 for Net.WebClient by setting the security-protocol with ServicePointManager.SecurityProtocol.

Furthermore you can use DownloadString instead of converting the downloaded data to a string.
I would also wrap it inside a Try/Catch.

Function GetMyIP() As Net.IPAddress Using wc As New Net.WebClient ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 Try Return Net.IPAddress.Parse(wc.DownloadString("https://tools.feron.it/php/ip.php")) Catch ex As Exception Return New Net.IPAddress(0) End Try End Using End Function

.NET 4.0 supports up to TLS 1.0 while .NET 4.5 or higher supports up to TLS 1.2
For reference:

Improve this answer
Sign up to request clarification or add additional context in comments.

1 Comment

I am now getting a System.NullReferenceException with additional info of "Object reference not set to an instance of an object". This occurs at line 36. tboxPublicIPv4.Text = GetmyIP().ToString

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.