Find the answer to your Linux question:
Results 1 to 2 of 2
I'm sure that this question is elementary for most here. I'm running a mail server on RH9.0 and i have the firewall settings set to high but within WebMin I ...
Enjoy an ad free experience by logging in. Not a member yet? Register.
  1. #1
    Just Joined!
    Join Date
    Nov 2002
    Posts
    61

    Firewall settings in Red Hat locking out remote DNS servers


    I'm sure that this question is elementary for most here. I'm running a mail server on RH9.0 and i have the firewall settings set to high but within WebMin I have both pop and smtp ports opened. I noticed by using the high settings within the security app in RH9 it auto sets my DNS servers to UDP 0/0 post 55. I change it to TCP the local public IP of the server but still no go. I can't contact my ISP's DNS servers, which in turn is causing problems with email.

    Any suggestions?

    Due to my lack of knowledge, it's probably something stupid I've done wrong.

    BD

  2. #2
    Linux Guru
    Join Date
    Oct 2001
    Location
    Täby, Sweden
    Posts
    7,578
    DNS uses UDP port 53, so just open that up and you should be fine.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •