When I check my website with W3C link checker, The checker shows:
Status: 403 Forbidden
“The link is forbidden! This needs fixing. Usual suspects: a missing index.html or Overview.html, or a missing ACL”
But that link is working fine. How can I resolve this issue from that link checker?
Screenshot:

That issue is usually used by over-zealous security filtering which either assumes that all bots are evil or that all bots using certain libraries are evil.
The checklink software uses the LWP library which often finds its way onto such blacklists. The two ways to get checklink to pass the link are:
Alternatively, you can check the links manually each time you perform a check.