I have a NW 6.5 SP5 server running named that host the a1.domain.com zone
with forward list setup to my ISP's DNS server.

Certain DNS lookups resulted in "can't find www.domain.ca non-existent
domain" error. However, if I query my ISP's DNS server, the result came
back properly. I don't have any "no forward list informations" setup for
this named server. Note that my server can result other .ca domain, e.g.
www.google.ca, www.ibm.ca properly.

I have reloaded named but same problem persist.

I have another server in a different physical location and was able to
forward the same query to my ISP and got back the result properly.

Please advise what would be the proper troubleshooting steps.

DSN Admin.