There was nothing obvious in the console. I'm sitting behind a mail gateway, and their logs didn't show anything out of the ordinary. Thanks for the Netstat suggestion. I've never been able to claim expertise on the iSeries, so every little bit helps. I'm constantly finding new basic things that I've never found before. Patrick Tom Kreimer <tkreimer@xxxxxxxxxxx> Sent by: domino400-bounces+ptrapp=nex-tech.com@xxxxxxxxxxxx 08/19/2005 09:50 AM Please respond to Lotus Domino on the iSeries / AS400 <domino400@xxxxxxxxxxxx> To Lotus Domino on the iSeries / AS400 <domino400@xxxxxxxxxxxx> cc Subject Re: CPU Spiking A message loop perhaps? That should be evident by watching the console I would think. As per Chris's Netstat suggestion, use F15 to subset (filter) for port 25, once for the local and once again for the remote. Besides looking for lots or rapid connections, also use F11 to check the byte counts. ==================================== Tom Kreimer Information Alternatives Domino 6.5.4 server on iSeries V5R2 The last couple of days we are seeing SMTP process spikes that are pushing the CPU to 98%+. SMTP task was at 86% for quite a while yesterday. So far, the only thing I've had any luck with is ending the SMTP task and restarting it. We are not seeing any indications of what might be causing this, but I'm not sure I know what to look for. Since I've been watching, I've seen the process spike briefly several times, but generally not long enough to cause the entire server to grind to a halt like it did yesterday. My boss is concerned that this is the result of some sort of attack on our system. Any suggestions would be much appreciated. Patrick _______________________________________________ This is the Lotus Domino on the iSeries / AS400 (Domino400) mailing list To post a message email: Domino400@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options, visit: http://lists.midrange.com/mailman/listinfo/domino400 or email: Domino400-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at http://archive.midrange.com/domino400.