From: "Massimo S." 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q=dns/txt; a=rsa-sha256; c=relaxed/relaxed; s=default; d=ecomstation.it; bh=nS8YGNEwj+uc/5W03C0Tlj4/EFgGhbWkZ2YX8gJ9qSA=; h=Return-Path:From:To:Subject:Date:Message-ID; b=CL10tmuIQRA9gFyiTpVzzguSFC1YJTFljXtHSafURqDjAoSwN6SZYgn5vgYYQubS4i/lh BYLmTn/V3vx63oQHxM9AiQS2bhSkufe8+4B0ZlSVMb3M/w3znxjY4LUIZDCXBHr/xGQucKd +FbFzAdqUEGw5r55REw/CCJaOvwCl3yPtW8QzE7BGS/8rxQkK+yGggmuOBR5htdYl/h2OrY SIe3tAgECfZ0iPv3AIVSl3xmY7C7zRTtZuJ2/dP3aquFt1yho3AQWj4ZEKSRaGVkDPh7liR hlAaNZlTNVvfz7JMRg4QT0rcB2+bn5TMdE/A8feWVoNL5w7xdknem+dyrXAg== Received: from [192.168.10.199] (dtp [192.168.10.199]) by srv2 (Weasel v3.05012) for ; Tue, 29 Jul 2025 08:42:54 -0000 Reply-To: ml@ecomstation.it Subject: Re: [eCS-ISP] socket - no buffer space availble To: eCS ISP Mailing List References: Organization: Massimo S. Message-ID: <20d71234-71c4-e5f6-98a2-4c94f6cccb28@ecomstation.it> Date: Tue, 29 Jul 2025 08:42:53 +0200 User-Agent: Mozilla/5.0 (OS/2; U; Warp 4.5; it-IT; rv:1.7.13) Gecko/20060424 Thunderbird/1.0.8 Mnenhy/0.7.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=iso-8859-15; format=flowed Content-Language: it Content-Transfer-Encoding: 8bit Il 29/07/2025 01:47, Peter Moylan ha scritto: > On 29/07/25 02:44, Lewis G Rosenthal wrote: > >> When you run out of network buffers, something is likely leaking >> network buffers (i.e., using them and not returning them to the pool >> when finished). >> >> You should start closing applications one at a time until the number >> of available buffers returns to a more normal level (netstat -m is >> your friend), then restart those applications. Either there is a >> configuration setting which might be changed or a defect in the code >>  causing this. > > Yes. Do this slowly enough so that you can tell which "close" fixed the > problem. That will be the one using up resources. > > You obviously already have anti-attacker measures in place for Apache. > > If Weasel turns out to be the culprit, reduce the "Max users" numbers. > Similarly for other programs. > > Yesterday I started a new Weasel to test it. Immediately, even before > initialisation had finished, there were four simultaneous POPS sessions, > all from the same address. The number of attackers is clearly increasing > since I accepted input on the POPS port, and the only way to stop them > (apart from blacklisting those addresses, of course) is to have smaller > "Max users" limits. Hi Peter, this situation do not happens on the 2 MTA VMs. So it's not weasel. massimo