> On 7/14/2012 11:40 PM, Ryan Pugatch wrote: > > While this problem occurs, does SSH work? IMAP? Anything other than > SMTP? Have you disabled any/all iptables/ipfilter rules and disabled > AppArmor/SELinux? Is there a firewall other than the NAT device in the > packet path, i.e. in the new datacenter? Have you looked at the logs of > the router(s) in the new datacenter?
That is worth testing - I only have SMTP open on those machines but I could open SSH to our office and see if that port gets blocked too. Good idea! iptables and selinux are disabled. There is an ASA firewall in the office and an ASA firewall in the new datacenter. Not seeing anything interesting at that level. > Could be an issue with the NAT router in your office. Which make/model? ASA 5510's in both the datacenter and the office. No esmtp fixup though. > This isn't a kernel issue nor a Postfix issue, but a network issue. > Given this outsourced datacenter architecture is brand new as of > yesterday, and given the problem description and troubleshooting thus > far, it sounds like a NAT, packet loss, or firewall issue. > We run the network all the way up to the border routers talking BGP with our providers so we have a good level of control. I am just uncertain of what could be doing this at this point. Thank you for your response. -Ryan
