Does Eudora need UPD 53?

Discussion in 'other firewalls' started by taba, Aug 2, 2002.

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  1. taba

    taba Registered Member

    Joined:
    Jul 27, 2002
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    I read that Eudora only needs access to TCP 143, 110, and 25 so limited Eudora access to those ports in my firewall. Worked fine that way for a couple of days. Now, since this afternoon, I am unable to send mail, but can receive it. Didn't make any changes.

    So what's the prob? Am I supposed to manually add Eudora access on UDP 53? Is this wise?

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    In ZoneLog: "DNS. Hackers/crackers may be attempting to do zone transfers (TCP), to spoof DNS (UDP), or even hide other traffic since port 53 is frequently neither filtered nor logged by firewalls.

    An important thing to note is that you will frequently see port 53 used as the source UDP port. Stateless firewalls frequently allow such traffic on the assumption that it is a response to a DNS query. Hackers are increasingly exploiting this to pierce firewalls."
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