The ARISS APRS packet system is not working at present. This is due to an as-yet unidentified anomaly involving the radio serving the system on board the ISS. A similar problem has occurred in the past, and steps taken to resolve the problem have proven to be only temporary.
“The system may return to service as it has in the past or it may have finally failed completely,” ARISS said in a stateme…
Source: ARRL News
Link: ARISS Space Station APRS Packet System Currently Off Line