Hi ,
Before going further, I would appreciate your help in clarifying the following situations:
Please first run "nslookup" and type in the server FQDN. Then check the IP address what you get back is correct. It would be helpful for us to identify the problem if you could upload the results.
Note: since this is a public forum, everyone could view your information, please remove private information that might leak your privacy.
>> some clients can't connect to file server with IP address, but with FQDN.
What's the error message when you can't connect to file server with IP address ? Please post the detailed error message for us to troubleshooting.
Could you ping the server IP address when you can't connect to file server with IP address ? If you can ping the server IP successfully, this is might not be a network problem.
Here is similar thread discussed before, you could have a look:
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---Please Accept as answer if the reply is helpful---
Best Regards,
Candy