OP, i had the same issue. Traced it back to an untrusted cert. Here is a KB I found that resolved the issue.   [URL]
SupportAssist Enterprise is unable to verify the connection status because of an internal error.If the problem persists, contact Dell technical support for assistance. Version: 1.2.1.20 Upload server certificate is trusted. TCP80/443 allowed/not blocked... any ideas please?
Dell EMC Upload Server Test Fails