Hello, im running plesk 7.5 server with windows standart edtion. im also runnig 'Microsoft DNS Server 5.2.3790.1830' . the problem is that the sites are not working with my ISP , i check few ISP'S by 'nslookup' and they are ok , but few ISP's its not . i contact them and i have been told by there DNS TEAM that my dns server isnt standing by RFC rules. they also told me that the TTL of the SOA is 0 , and it should be more than hour . here is a picture of screen shot of the configurations : Thanks in Advance.