Sent this out a while back. Don't think I got any replies. Anyway, Still happening but now with squid 3.1.10/3.1.11 I'd like to do a phased upgrade to 3.1.x but don;t want to try it if I'm still getting these netdb errors Rgds Alex Hi, For a while now I've been running a squid 2.7stable7 service here (just upgraded to stable9) and thought I'd try out the 3.1.4 build on my test web cache. Although the test cache is linked into my production cache cluster as a sibling the universtiy access the cache service via a serveriron hardware load balancer which load balances traffic over all my 2.7.STABLE9 boxes. I access the test cache directly. Since this morning, when i upgraded to 3.1.4 I've been seeing the following in the 3.1.4 cache.log file 2010/06/21 12:14:12| storeLateRelease: released 0 objects 2010/06/21 12:14:33| netdbExchangeHandleReply: corrupt data, aborting 2010/06/21 12:14:33| netdbExchangeHandleReply: corrupt data, aborting 2010/06/21 12:14:41| netdbExchangeHandleReply: corrupt data, aborting 2010/06/21 12:18:59| Detected DEAD Sibling: wwwcache3-east.hull.ac.uk 2010/06/21 12:18:59| Detected DEAD Sibling: wwwcache4-east.hull.ac.uk 2010/06/21 12:18:59| Detected DEAD Sibling: wwwcache1-west.hull.ac.uk 2010/06/21 12:18:59| Detected DEAD Sibling: wwwcache3-west.hull.ac.uk 2010/06/21 12:18:59| Detected DEAD Sibling: wwwcache1-east.hull.ac.uk 2010/06/21 12:18:59| Detected REVIVED Sibling: wwwcache1-west.hull.ac.uk 2010/06/21 12:18:59| Detected REVIVED Sibling: wwwcache3-west.hull.ac.uk 2010/06/21 12:18:59| Detected REVIVED Sibling: wwwcache3-east.hull.ac.uk 2010/06/21 12:18:59| Detected REVIVED Sibling: wwwcache1-east.hull.ac.uk 2010/06/21 12:18:59| Detected REVIVED Sibling: wwwcache4-east.hull.ac.uk 2010/06/21 12:54:11| NETDB state saved; 821 entries, 3 msec 2010/06/21 12:54:45| netdbExchangeHandleReply: corrupt data, aborting 2010/06/21 12:54:45| netdbExchangeHandleReply: corrupt data, aborting 2010/06/21 12:54:52| netdbExchangeHandleReply: corrupt data, aborting 2010/06/21 13:11:28| Detected DEAD Sibling: wwwcache4-east.hull.ac.uk 2010/06/21 13:11:28| Detected DEAD Sibling: wwwcache2-west.hull.ac.uk 2010/06/21 13:11:28| Detected REVIVED Sibling: wwwcache4-east.hull.ac.uk 2010/06/21 13:11:28| Detected REVIVED Sibling: wwwcache2-west.hull.ac.uk 2010/06/21 13:40:18| netdbExchangeHandleReply: corrupt data, aborting 2010/06/21 13:40:25| netdbExchangeHandleReply: corrupt data, aborting 2010/06/21 13:40:26| netdbExchangeHandleReply: corrupt data, aborting 2010/06/21 13:55:15| NETDB state saved; 821 entries, 3 msec Don't think I've seen this before. Web cache configs available if necessary. Anyone else trying to mix 2.7 and 3.1 siblings? Rgds