When analyzing telemetry data for bug 1284915 it became apparent that additional network errors should be handled similar to what was done in bug 1284915. Basically, if some of the mar file has already downloaded it should continue from where it left off. Possible error codes to handle | | Count | Total | Network Error Code | Count | Percent | Percent | --------------------------------------+-------+---------+---------+ NS_ERROR_UNKNOWN_HOST | 743 | 76.84% | 2.57% | NS_ERROR_ABORT | 65 | 6.72% | 0.22% | NS_ERROR_NET_INTERRUPT | 36 | 3.72% | 0.12% | NS_ERROR_CONNECTION_REFUSED | 35 | 3.62% | 0.12% | NS_ERROR_NET_RESET | 32 | 3.31% | 0.11% | NS_ERROR_PROXY_CONNECTION_REFUSED | 28 | 2.90% | 0.10% | NS_ERROR_NET_TIMEOUT | 16 | 1.65% | 0.06% | NS_ERROR_FAILURE | 7 | 0.72% | 0.02% | NS_ERROR_NOT_AVAILABLE | 5 | 0.52% | 0.02% | --------------------------------------+-------+---------+---------+ All | 967 | 100.00% | 3.34% |