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Problems with mail

By vmisanovic ·
Our network has a server running Linux Rad Hat 7.0 and Samba; and two gateways. On one gateway is a firewall, another is a mail gateway. We use a DSL line for Internet connection. PCs have Windows 2000 or Windows NT OS. Network worked well for a while, and then the problems started. In the morning, when I come, I cannot read my e-mail (our mail server is not available), although I can log in and retrieve data from server. When I reboot computers IN PARTICULAR ORDER (gw2, gw1 and finally server) after 5 minutes I can retrieve my mail. Any idea what is wrong? ONCE AGAIN, IT ALWAYS HAPPEN DURING THE NIGHT.

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Problems with mail

by bg4 In reply to Problems with mail

A bit more information would be helpful. When the problem occurs, can you ping the two gateways and the server? Is this common to all workstations, 2000 and NT? Are you running DNS, DHCP or just a "hosts" file?

Rod.

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Problems with mail

by vmisanovic In reply to Problems with mail

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Problems with mail

by vmisanovic In reply to Problems with mail

DNS.

I can ping all of them.

It is common for Windows 2000 and NT.

Thanks.

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Problems with mail

by rob In reply to Problems with mail

I can't tell very much from the description, but the "reboot in a certain order" story sounds like a problem with DNS. Rebooting of GW1 and GW2 in a specific order implies that at least one of the server's is the email server's primary DNS server and the other machine might be the secondary DNS server. I had I simular problem like this when I discovered I error in my DNS configs.

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Problems with mail

by vmisanovic In reply to Problems with mail

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by rob In reply to Problems with mail

Another posibility: What type and version of email server are you running? What version of Linux? I see alot of malicious attempts of Nimbda type worms trying to penetrate my firewalls and web servers. You not only need to make sure you have a good firewall policy but also that your software is up to date with the latest patches. Your DNS server and/or web servers can bomb if they are attacked. This is much less likely if your software is up to date.
Also, be sure to look at your system logs for clues.

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Problems with mail

by vmisanovic In reply to Problems with mail

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by vmisanovic In reply to Problems with mail

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