Hallo, ich hab folgendes Problem:
Nov 26 19:39:19 rocoto013 sshd[16867]: Illegal user katsuhisa from ::ffff: │
│~220.228.225.34 │
│Nov 26 19:39:25 rocoto013 sshd[16869]: Illegal user katsuie from ::ffff:22 │
│~0.228.225.34 │
│Nov 26 19:39:28 rocoto013 sshd[16871]: Illegal user katsumasa from ::ffff: │
│~220.228.225.34 │
│Nov 26 19:39:31 rocoto013 sshd[16873]: Illegal user katsumitsu from ::ffff │
│~:220.228.225.34 │
│Nov 26 19:39:33 rocoto013 sshd[16875]: Illegal user katsumoto from ::ffff: │
│~220.228.225.34 │
│Nov 26 19:39:36 rocoto013 sshd[16877]: Illegal user katsunaga from ::ffff: │
│~220.228.225.34 │
│Nov 26 19:39:40 rocoto013 sshd[16879]: Illegal user katsutoshi from ::ffff │
│~:220.228.225.34 │
│Nov 26 19:39:43 rocoto013 sshd[16881]: Illegal user katsutoyo from ::ffff: │
│~220.228.225.34 │
│Nov 26 19:39:45 rocoto013 sshd[16883]: Illegal user katsuyori from ::ffff: │
│~220.228.225.34 │
│Nov 26 19:39:48 rocoto013 sshd[16885]: Illegal user katsuyoshi from ::ffff │
│~:220.228.225.34 │
│Nov 26 19:39:51 rocoto013 sshd[16887]: Illegal user kattengell from ::ffff │
│~:220.228.225.34 │
│Nov 26 19:39:54 rocoto013 sshd[16889]: Illegal user katya from ::ffff:220. │
│~228.225.34 │
│Nov 26 19:39:56 rocoto013 sshd[16891]: Illegal user katy from ::ffff:220.2 │
│~28.225.34 │
│Nov 26 19:39:59 rocoto013 sshd[16893]: Illegal user kaufman from ::ffff:22
Das steht in meinen Serverlogs über 200 mal. Was kann ich dagegen machen???