In the past, our SNMP and SSH sensors have shown a down status sporadically, throwing timeout and authentication errors without any obvious reasons. Suddenly many sensor types using SNMP and SSH are down and show these errors. Now they do not turn up again. We did not change anything on the target systems like passwords or private keys. The credentials we defined in PRTG are still correct.
What can be the reason for these SNMP and SSH timeouts and auth errors? How can I avoid these SNMP and SSH sensor instabilities?