Help please {No Such host is known} error

Jose Saiz

5y15k.NET

I am using the following code under windows 2016 Standard Server IIS10 - .NET Framework 4.0

Goal to obtain the remote client computer name.

C# Code Behind

Default.aspx.cs

var RemoteClient_DevineName = System.Net.Dns.GetHostEntry(HttpContext.Current.Request.ServerVariables["REMOTE_HOST"]).HostName;

Result is this error message below

Server Error in '/' Application.

No such host is known

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Net.Sockets.SocketException: No such host is known

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[SocketException (0x2af9): No such host is known]

System.Net.Dns.InternalGetHostByAddress(IPAddress address, Boolean includeIPv6) +2943591

System.Net.Dns.GetHostEntry(String hostNameOrAddress) +8625688

Thank you for your help.

2 Replies

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Jose Saiz5y ago
Thank you Sachin for your reply, I've tried with REMOTE_ADDR as well and got the same error message.

It is unbelievable how Microsoft is losing their programming ground, every time they make any changes to either the OS or the visual studio they end up messing up the good things.

The above mentioned code was working fine until all Microsoft patches came about, no wonder Python is leading the programming business.

Thanks again Sachin Singh
0
Sachin Singh5y ago
string clientMachineName;
clientMachineName = (Dns.GetHostEntry(Request.ServerVariables["remote_addr"]).HostName);
Or
string IP = Request.UserHostName;
IPAddress myIP = IPAddress.Parse(IP);
IPHostEntry GetIPHost = Dns.GetHostEntry(myIP);
List<string> compName = GetIPHost.HostName.ToString().Split('.').ToList();
string mycompNameRemote = compName[0];
0