Due to a change in the support request file upload process, VMware Support Assistant 5.1 temporarily cannot be used to upload files. For more details, see knowledge base article: VMware Support Assistant 5.1 will fail to upload log files (2059759). Subscribe to the article to be notified when there are updates.
Support requests can still be filed through Support Assistant, but you must use a temporary manual FTP process to upload files to VMware Technical Support. To provide supporting information like log files, configuration files, and screenshots, follow the instructions in knowledge base article: Uploading diagnostic information for VMware (1008525).