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The Cisco ASA 5510 cannot perform DNS resolution from the inside after an upgrade

Core issue

These are the condition in which this occurs:

  • If there is a problem on the switch port

  • After an upgrade of the Adaptive Security Appliance (ASA) code

Resolution

Perform these steps to ensure that the ASA can access the Internet:

  1. Issue the ping command to check whether the ASA can access the Internet.

     
  2. Check the default gateway of the ASA and ensure that the gateway points to the router or switch connected to the Internet.

     
  3. Look for Cyclic Redundancy Check (CRC) errors on the switch or router interface to determine whether the ports on the gateway device are configured with the appropriate speed.

     
  4. Change the cable between the gateway switch and the ASA, and if necessary, change the switch port.

  5. Downgrade the ASA code.

Problem Type

Connectivity to the device

Upgrade or install

Troubleshoot software feature

Product Family

ASA Hardware & Software

ASA Software Version

7.0

7.1

ASA Models

ASA 5500

Features & Tasks

Domain Name System (DNS)

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