Bug #67253 unable to connect trough ipv6 via .net connector 6.6.3

Submitted:	16 Oct 2012 7:41	Modified:	3 Jan 2013 2:23
Reporter:	Tardi Sndor	Email Updates:
Status:	Closed	Impact on me:	None
Category:	Connector / NET	Severity:	S2 (Serious)
Version:	6.6.3	OS:	Windows (Win7)
Assigned to:	Roberto Ezequiel Garcia Ballesteros	CPU Architecture:	Any
Tags:	ipv6, MySqlException, UnableToConnectToHost

Description:
It is impossible to connect to a server trough ipv6. There is condition check in a foreach loop in function GetStreamFromHost of the StreamCreator class (Line 71):

if (address.AddressFamily == AddressFamily.InterNetworkV6 && !this.driverVersion.isAtLeast(5, 5, 3))
            continue;

At this ponint there is no valid driverversion, since the version is queried after connection.

How to repeat:
Try to connect trough ipv6

Suggested fix:
The version struct should have a private default constructor to avoid such problems.

Same with 6.6.3.

It works if those two lines are commented out

Added to changelog for 6.4.6: 

Connection attempts using IPV6 addresses in Connector/Net would fail.

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