Hi - wonder if someone can explain this to me, or tell me if I'm defining my service incorrectly. I have a simple TCP check as such: define service{ use remote-service service_description DESKTOP SNA SERVICE TCP 4097 notification_interval 5 hostgroup_name desktopsnahisservers contact_groups dtns-admins24x7 contacts tdwilkn check_command check_sts!4097 } define serviceescalation{ hostgroup_name desktopsnahisservers service_description DESKTOP SNA SERVICE TCP 4097 first_notification 2 last_notification 0 notification_interval 5 contacts tdwillc } Is it ok to have both contact_groups and contacts defined in the same service? I ask because this check failed for a couple of hours over the weekend but looking in the nagios log I can see that on the first notification both dtns-admins24x7 and tdwilkn got an email. But then every 5mins ONLY dtns-admins24x7 got an email - tdwilkn received nothing more when he should have. I also have a serviceescalation defined and this worked as expected with tdwillc also getting an alert every 5mins after the 2nd failure. Any help would be appreciated. Thanks - Julian. Julian Grunnell | Unix Analyst, Infrastructure | TD Direct Investing T: +44 (0) 113 346 2824 | M: +44 (0) 7889 352527 ----------------------------------------------- Consider the environment: Please don't print this e-mail unless you really need to. Confidentiality: This email and its attachments are intended for the above named only and may be confidential. If they have come to you in error you must take no action based on them, nor must you copy or show them to anyone; please reply to this email and highlight the error. Viruses: Although we have taken steps to ensure that this email and attachments are free from any virus, we advise that in keeping with good computing practice the recipient should ensure that they are actually virus-free. Brokerage services provided by TD Direct Investing (Europe) Limited (a subsidiary of The Toronto-Dominion Bank). Authorised and regulated by the Financial Services Authority (FSA registered number 141282), member of the London Stock Exchange and the PLUS market. Incorporated in England and Wales under registration number 2101863. Registered office: Exchange Court, Duncombe Street, Leeds LS1 4AX. Banking services provided by TD Bank N.V. authorised and regulated by De Nederlandsche Bank and the Financial Services Authority for UK Business (FSA registered number 216791). Incorporated in the Netherlands and registered as a branch in England and Wales under branch registration number BR006780. ------------------------------------------------