If you are booking shipments with WooCommerce, and are getting the below error message:
Even if the connection looks okay:
One of possible causes is hitting a PHP memory limit.
There are two possible solutions.
1. First, is to increase memory limit. You need to check this with your developers if you're not familiar on how to do this.
2. Second is to disable other plugins. If there are plugins that you don't really need, you can try to disable one of them and see if that will make any difference. If you need that type of plugin, try to look for an alternative that will consume less memory.
If you have tried the above, and is still unable to ship properly, please contact support.