On 9/11/07, Jun Salen <nokijun at yahoo.com> wrote: > >Hi List, > > > >My Mail/Proxy server has from time to time refuse to > >accept accept network connection. If I restart the > >network service, the service will again start to > >accept connection but after some time will again > >refuse connection. I use CentOS 4.5 with Squid, > >DansGuardian, Postfix. Please can someone point me > >what are the possible cause of this. Thank you. > > In addition to my posting above. When I make ping to > other machine from the server, the server will again > restore and accept connection. This is weird, so my > temporary solution is to let the server continually > ping other machine. Please help. Thanks again. > Ping is a very cheap and acceptable solution ! Anyway you'r certainly curious about the problem :-) This is a problem about ARP request. Maybe another machine with low activity share the same IP or your swith/hub is badly configured ! You can use arping to detect any device with the same IP and tcpdump to look for arp request."arp -an" will show you the arp table. Regards > junji > aisalen.wordpress.com > Linux Registered User #253162 > > Send instant messages to your online friends http://uk.messenger.yahoo.com > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Alain Spineux aspineux gmail com May the sources be with you