Ensuring that the Tableau Server has the correct LDAP server address, port, and credentials configured The primary action to resolve integration issues with an external LDAP server is to ensure that Tableau Server has the correct LDAP server address, port, and credentials configured. Incorrect configurations can lead to failed connections, so verifying these settings is crucial for successful LDAP integration. Option A is incorrect because changing the LDAP server's authentication protocol is an extensive measure and should be considered only after verifying the current configuration. Option C is incorrect as upgrading network infrastructure, while beneficial for overall performance, is not the first step in addressing specific LDAP connectivity issues. Option D is incorrect because installing additional security software does not directly address potential con-figuration issues with LDAP integration.