Are you saying Dell Boomi’s HTTP Client connector only supports HMAC-SHA1? Unless there is a way for you to insert your own authentication code vis something like a plug-in, IO assume you need to contact Boomi and find out when they will be upgraded to support HMAC-SHA256. It really should be up to the vendors to make updates like this, not the end user. Let them know that from July 12 to July 15 Netsuite will disallow HMAC-SHA1 again, and that it will be fully shutdown in the next release. They should already be working on a fix, I would presume.