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The first SSH connection to the DMZ fails through the PIX 500 series firewall with software version 6.x

Core issue

This issue is documented in Cisco bug ID CSCsb34758 .

When the connection is built to the server located on the Demilitarized Zone (DMZ) interface, the first connection does not go through even after the correct authentication.

Resolution

For a workaround, close the first connection. This makes the susequent connections go through successfully.

As an alternative, upgrade to any of the latest versions. Refer to Software Download: Cisco PIX Security Appliance Software.

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