HTTP status 404: Not Found error while accessing WCF service through an ASMX client

HTTP status 404: Not Found error while accessing WCF service through an ASMX client
I have personally faced this error without any accurate reasons explained in the server's log/trace. With some trial and error, I just managed to resolve it. Here is how it worked for me.

Reason 1:
If you have recently modified the address of your WCF-services' basicHTTP endpoint, this new address does get updated in the client's web.config automatically by just updating the web-reference (should it not do it as it does when the web-reference ia added for the first time?). You'll need to manually update the web-reference address in the client web.config to get it working.

Reason 2:
If you are using the "TransportCrendentialOnly" mode at the WCF-servcie endpoint, if you can, switch to "Transport" mode, it works.

Helpful? Do post your resolutions, if you got any more on this problem. Thankyou. :)