FiloSottile / FiloSottile/Heartbleed

negative serial number?

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Description

```
$ repos/heartbleed/bin/Heartbleed (a Cisco ASA)
2014/04/12 23:48:39 (my ASA) - ERROR: tls: failed to parse certificate from server: x509: negative serial number
```

Any idea what that is about? The browser deals with it. Chrome reports the serial as 2257982035. It is a self-signed cert generated by the device, so I can imagine it's wrong, but I'm surprised at that.

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