On Tue, 2013-06-18 at 12:54 +0200, Milan Obuch wrote: > Hi, > > today I see something strange on one of my servers... > > Excerpt from mailog file: > > Jun 18 12:47:10 huon courierd: > started,id=00062014.0000000051C0384F.00011683,from=<postmaster>,module=esmtp,host=dino.sk,addr=<[email protected]> > > Jun 18 12:47:23 huon courieresmtp: > id=00062014.0000000051C0384F.00011683,from=<postmaster>,addr=<[email protected]>: > No route to host
Generally, in my experience, this error indicates a routing issue rather than a firewall issue. I've seen this on one of my own servers as a result of load balancing en route, where routing decisions are based on the transport layer (TCP/UDP/ICMP) rather than the internet layer. ICMP ping packets will take one route, whereas TCP and UDP packets will take another, so a ping will work, but a connection using another transport protocol will fail. This is probably temporary. -- Lindsay Haisley | "UNIX is user-friendly, it just FMP Computer Services | chooses its friends." 512-259-1190 | -- Andreas Bogk http://www.fmp.com | ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ courier-users mailing list [email protected] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
