.ca domains anyone have problems with resolving

We have hosted a few for a while and all of a sudden they stopped resolving for our clients.

Our network can look them up trace and ping fine.

However they cant and none of the lookup tools on the web can find the domain. all say do not exist.

has anyone seen this before have any ideas ?

I am searching for some info now but not finding much.

 

 

 

 

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