Fix VPN hostname resolution by flushing your DNS cache

Sometimes when my VPN connection to work goes down, certain applications that rely on intranet servers (e.g. Lotus Notes, Lotus Sametime) become unable to reconnect to their servers even after I reconnect to VPN. This is due to the operating system’s DNS lookup cache reusing the failed hostname lookup from when VPN was down rather than doing a fresh hostname lookup now that there is a fresh VPN connection.

On Windows, you can fix the issue by opening up the Command Prompt as Administrator and running the following command:

ipconfig /flushdns

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s