I recently configured a cisco ASA 5500 firewall with PAT & basic filters. Everything is ok other than DNS. I dont have any internal DNS servers I am using my ISPs DNS servers for name resolutions. In the nslookup utility of a client computer all the URLs are getting resolves perfectly. But I type the same URL in the browser it's not working. But if I type the IP address of the same URL in the browser it works perfectly. Wonder why this happen. Is this something to do with maximum DNS packet size or something else. Please let me know.
Thanks in advance
Here I am attaching the sh run output and the syslog messages