Cant get proper client IP address on server side WCF

For obtaining client IP in WCF i use the following method:

public static byte[] GetUserIP(Operatio开发者_Go百科nContext context)
        {
            var messageProperties = context.IncomingMessageProperties;
            RemoteEndpointMessageProperty endpointProperty =
                messageProperties[RemoteEndpointMessageProperty.Name]
                as RemoteEndpointMessageProperty;

            return GetIPFromString(endpointProperty.Address);
        }

My machine has some local IPv4 and this method was working until yesterday.. May be our network admins changed something; i dont know, but now the endpointProperty.Address is returning "::1" and not "xxx.xxx.xxx.xxx". Can someone explain what can cause such thing?

This is because your machine is now using IPv6 loopback instead of IPv4.

It will also affect intranet IP addresses as your Admins have likely enabled IPv6 across the board - so Machine A will identify itself to Machine B with it's IPv6 address.

In a public environment it's unlikely to cause a problem until the entire interweb moves to IPv6.

Either way, you should ensure that you use the methods in IPAddress to parse the endpoint's IP rather than hand-cranking your own.

I also got caught out by a similar problem when I set up a database column that would be used to track IP addresses as varchar(15); worked greta until the same thing happened to us internally and all of a sudden all my request logging starting breaking on internal requests!