I took a quick look at marc021 and yes, I cannot ssh into 192.168.0.1 (rck00). Nor can I ssh into 192.168.0.3 (rck02).
In cases like this, the first thing to try is a retraining (sccBmc -i) and a reboot (sccBoot -l). I don't know if you are using the default SCC Linux or your own. If it still remain inaccessible, power cyle if you have the privilege. If not, flag it as a bug in our Bugzilla in the category "Marc Administration needed". Bugs in this category are treatyed as job tickets. We'll then power cycle and retrain and reboot for you.