Techniques are disclosed relating to diagnosing a network-accessible device. A first computer may store authorization information associated with a plurality of network-accessible computing devices associated with a user. The first computer system may receive, from a second computer system, a request from the user to perform a diagnostic operation that involves communication between a third computer system and a particular one of the plurality of network-accessible computing devices. The first computer system may request, based on a permission indicated by the stored authorization information, that the third computer system retrieve diagnostic information from the particular network-accessible computing device and perform the diagnostic operation. The first computer system may receive, from the third computer system, result information relating to the diagnostic operation.