[clug] POP and iptables problem

Simon Haddon simon at sibern.com.au
Thu Nov 4 04:28:46 GMT 2004

Antti.Roppola at brs.gov.au wrote:

>Hi all,
>Last night I graciously volunteered my time to shift
>a community group's web access from dial-up to ADSL.
>In went a IPCop based firewall (very nice) and after
>some testing to ensure web and email worked OK, I cut
>the whole office over. Currently HTTP, DNS, POP & SMTP
>are the only ports allowed through. Further testing confirmed
>that web, SMTP and POP3 all worked.
>So I get a call this morning. No good deed goes un-punished...
>Whilst SMTP and web still work, POP3 from the Windows98
>desktop running Outlook does not. Outlook cannot retrieve
>mail and I get an error code that looks up as:
>   0x800   CCC0E FAILED_TO_CONNECT Cannot connect to server.
Is it possible that they have activated a firewall on the windows 98 box 
(ie Trend Micro's or Nortons).

Another thought is that outlook might still be expecting that a dialup 
account must be present if it was the machine that use to dial into the 
ISP.  Do you still have any dialup information defined in your network 
settings or IE's settings that could affect Outlook?

>Now if I telnet to port 110 on the pop server from that Win98
>desktop, I can establish a connection with the POP server and
>get "OK" messages most of the way through authentication (I don't
>have the password and the owner was out). I try (no success)
>adding port 995 (SSL) to the ruleset.
>There is a possibility that the password stored in Outlook for
>that POP account is incorrect. The machine had a variety of
>backdoors and trojans (partially?) removed yesterday.
>Now, since I can connect to the POP server OK, I am inclined to
>think that the issue has nothing to do with the firewall. Is this
>a reasonable assumption? Or have I missed something important?
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