Several NetSuite help topics suggest adding "*.netsuite.com" to your firewall configuration. This is not always possible. If the firewall in your company's infrastructure abides by strict rules, it will not accept URLs that include an asterisk (*) as a wildcard character. If this is the case for your company, you must add your account-specific domains to the firewall configuration. To update your company firewall to accommodate your account-specific domains: Examples of the new account-specific domains for the UI that you must add to your firewall include the following, where the <accountId> represents a variable that you must replace with the account ID of the sandbox in which you are testing: Add to your firewall: For example, if your sandbox account ID was 123456_SB1 https://<accountId>.app.netsuite.com https://123456-sb1.app.netsuite.com Note: An underscore is not an acceptable character in a domain name. The account-specific domain name generated for a sandbox transforms the underscore into a hyphen and makes the SB lowercase. If you require assistance or more information, please contact NetSuite Customer Support.