- **labels**: --> dns
- **assigned_to**: Daniel Stenberg
- **Comment**:

On which platform? I assume you've build libcurl to use the c-ares backend?

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** [bugs:#1346] resolver error**
**Status:** open
**Labels:** dns 
**Created:** Mon Mar 17, 2014 03:40 PM UTC by Christian Hesse
**Last Updated:** Mon Mar 17, 2014 03:40 PM UTC
**Owner:** Daniel Stenberg
libcurl has a resolver bug that requires some conditions to trigger:
* libcurl tries to resolv A and AAAA records
* DNS response is too long to fit into a UDP packet
What happens:
* libcurl sends two DNS UDP requests, one for A record, one for AAAA record
* libcurl receives one truncated UDP response
* libcurl sends TCP request
* libcurl receives TCP response
* libcurl sends TCP reset, ignoring the response
Everything works just fine when querying only A record (give option -4).
A capture demonstrating the problem is attached.
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