Google webmaster tools detect 4 URLS which can not be found, which is normal as the URLs do not exist. I can not find any problem with my source. so I suppose those are external links. How can I find out where those link come from? I tried a google search without success.
To check who's linking to you, you can use this free tool for it: marketleap.com/publinkpop/ use link popularity check, add the information and press generate report. On the next screen you can click on the numbers to see who's linking to you from Google & Yahoo. If you have an internal page missing, then the best you do, is adding a sitemap. You can find that option also in Google webmaster tools. Greetings Jason
I always see 2 or 3 links in the URL not found list. These urls are not in my site. Not sure but I think these are external links.