i have a product e.g
http://example.com/au/catalog/product/view/id/769 (also not viewable by using
Request Path e.g productname.html)
it redirects me to no-route
anyone knows what is the problem?
That one can have many causes, most common:
If none of them are the case, kick caches and indexes
If that still doesn't work, sometimes changing enabled/disabled and in stock/out of stock back and forth can help, as can taking it out and back in a category (that is in the "weird bug" category)
Update: your example URL has a "store view" path /au/ in it - this brings me to
Update: multi country/region set up
Not knowing how much is customised on your site, I would start to look at what is different in each "scope" store / store view (you get a drop down on the top left to switch from website level to store/store view)
If it is just the one or the other products, others are fine, then it is probably an attribute issue. One that needs to be set correctly for the product to show.
Much more messy: check your country tax zone and tax rules settings, and that the tax class this product is in is appearing in rules for Australia... A product in a tax class which is not associated to a particular country might not show in that country (or it could show but not be buyable, I haven't messed with this for a while)
Also, settings around currency/price if you have enabled multi currency. A product which does not have a price might not show