I'm using SQL Server Express included with vCenter Server. I'm only have 3 hosts with 40 VMs.
I guess the account used for the connection is a_sydubois. It's an account admin of the server. In ODBC, the authentification is Windows integrated and the install has been done with this account.
I'm using self-signed certificates.
I'll check the KBs. I read some KBs that not directly talk about 5.5 but I not remember them.