journalctl -u sshd | grep 'Unable to negotiate' | cut -d ' ' -f 1-2 | uniq -c 5 Dec 11 5 Dec 13 1 Dec 17 1 Dec 19 5 Dec 20 15 Dec 21 49 Dec 22 8 Dec 23 4 Dec 24 8 Dec 26 24 Dec 27 4 Dec 28 2 Dec 29 5 Dec 30 2 Dec 31 5 Jan 01 21 Jan 02 1 Jan 03 10 Jan 04 2 Jan 05 7 Jan 06 5 Jan 07 21 Jan 08 10 Jan 09 5 Jan 10 57 Jan 12 6 Jan 14 1 Jan 15 16 Jan 16 4 Jan 17 1 Jan 23 19 Jan 24 14 Jan 29 5 Jan 30 4 Jan 31 1 Feb 03 1 Feb 04 16 Feb 05 3 Feb 08 19 Feb 09 4 Feb 14 1 Feb 15 4 Feb 16 3 Feb 17 4 Feb 18 22 Feb 19 15 Feb 20 4 Feb 21 1 Feb 24 15 Feb 27 12 Feb 28 36 Mar 01 15 Mar 06 1 Mar 07 19 Mar 08 41 Mar 09 2 Mar 11 2 Mar 13 4 Mar 14 55 Mar 15 2 Mar 16 15 Mar 17 1 Mar 18 5 Mar 20 23 Mar 21 17 Mar 22 15 Mar 23 2 Mar 24 18 Mar 26 5 Mar 27 7 Mar 28 20 Mar 30 30 Apr 02 6 Apr 04 5 Apr 05 1 Apr 08 9 Apr 09 15 Apr 10 5 Apr 11 18 Apr 12 5 Apr 13 24 Apr 17 823 Apr 18 3504 Apr 19 2596 Apr 20 4234 Apr 21 3209 Apr 22 4424 Apr 23 2844 Apr 24 692 Apr 25 915 Apr 26 138 Apr 27 378 Apr 28 209 Apr 29 52 Apr 30 128 May 01 96 May 02 740 May 03 981 May 04 1602 May 05 2372 May 06 1273 May 07 1492 May 08 1232 May 09 1359 May 10 1663 May 11 1803 May 12 1829 May 13 1652 May 14 1577 May 15 1333 May 16 1067 May 17 1103 May 18 1231 May 19 988 May 20 1165 May 21 1318 May 22 1462 May 23 824 May 24 1500 May 25 1157 May 26 485 May 27 259 May 28 1058 May 29 1163 May 30 807 May 31 848 Jun 01 1613 Jun 02 3527 Jun 03 1585 Jun 04 1688 Jun 05 302 Jun 06 475 Jun 07 3456 Jun 08 1455 Jun 09 1152 Jun 10 840 Jun 11 2200 Jun 12 2716 Jun 13 1038 Jun 14 1670 Jun 15 966 Jun 16 1176 Jun 17 1855 Jun 18 2249 Jun 19 1674 Jun 20 1507 Jun 21 209 Jun 22 1174 Jun 23 1158 Jun 24 1245 Jun 25 1388 Jun 26 2384 Jun 27 1567 Jun 28 3190 Jun 29 3073 Jun 30 2942 Jul 01 2579 Jul 02 920 Jul 03 26 Jul 04 1473 Jul 05 1758 Jul 06 907 Jul 07 2092 Jul 08 2268 Jul 09 511 Jul 10 428 Jul 11 1737 Jul 12 967 Jul 13 831 Jul 14 852 Jul 15