How to identify the PING issue

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Hi,

According to Cisco Document :

Three issues for ping :

"." --- Each period indicates that the network server timed out while waiting for a reply. This message can indicate many problems: =95 ping was blocked by an access list or firewall. =95 A router along the path did not have a route to the destination and did not send an ICMP destination unreachable message. =95 A physical connectivity problem occurred somewhere along the path.

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We identified:

1. Router path is learned and correct.
2. Physical connectivity is correct
3. We do not add any ACL in the Router

Question: How can we identify it is a IOS issue ?

Cheers