Resolve SSH connection too slow

SSH connection is very slow
Workaround:
Modifying a configuration file
/etc/ssh/sshd_config
Gssapiauthentication Yes--->no 81 rows or so
#UseDNS Yes-->usedns no 122 rows or so
The main thing is to disable the DNS query function, which can speed up the SSH connection.
[[Email protected] ~]# service sshd restart
Stop sshd: [OK]
Starting sshd: [OK]
[Email protected] ~]#
----------------------------
Warning:remote HOST identification has changed workaround
This whole Linux cluster these days, in doing test marking Packets with Iptables encountered a problem, want to log this error in the form of blog specific as follows:
When SSH 10.1.1.61
When a situation arises:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ warning:remote HOST Identification has changed! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT is POSSIBLE this SOMEONE is DOING SOMETHING nasty!
Someone could is eavesdropping on your right now (Man-in-the-middle attack)!
It is also possible, the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
D0:00:7c:bc:88:5c:dc:de:89:61:44:30:00:60:f9:b2.
Please contact your system administrator.
Add correct host key in/root/.ssh/known_hosts to get rid of the this message.
Offending key in/root/.ssh/known_hosts:1
RSA host key for 192.168.4.222 had changed and you have requested strict checking.
Host Key verification failed.

Workaround:
Cat's home directory first. ssh/know_hosts
Cat ~/.ssh/known_hosts
10.1.1.66 Ssh-rsa aaaab3nzac1yc2eaaaabiwaaaqeas86youhdfyumhkjumspfejcc0ztfqiwgiklyrnf4kvcz+ece/yy59qxnvg7b0dwa/ wyzlagrdumwfexx4y7ve3wuneexvpmrjf0yzgg5qw6edxnmequzzi5k7jg96vgq+5zzhtsrhuqxh1anrmyydrfmufdxth+ a3jkcoqlx9iiifouuuh5jeelql9w9frgmogoqmm3cvbn33mblyhza0uoa3gdpfgrxfjxypvluod90rjivc126cxik3tmsfs0emo7qxpz4mrng/ 1xpcqgkxnejbkrlutxzlxgbwuod3hpx7ob28uk1rdgsxhcztkspph3a04i7y5c5qz1xdxfzqw==
10.1.1.61 Ssh-rsa aaaab3nzac1yc2eaaaabjuhjuhgusi5flkoqayuhjmlxae69vlxa7en/smxxs+ vdjgxlglltldsoxki1cbdzupm4fefmes4a3x3mfab8l46rfnpje45hca4u6uc/ibjmlo8ghrws+ fpiyvdmmokabbql8li0j0bclmklsrfpnsusft/ hm5nbuulmqcoxzgqvolhrgv7jesdgvmoxlhzcsgrj62abtjxktv5dbh5vcxjeh4jfrn4frno7ikg3fa6nogbqus6tenaclxi8f1b+ 479ywaqqedy233n2gw+l5v6ms1ud+1jxxcihx8oto1/v7/vwlfeqfemu323y4zhu4uxflv9wb1xgnmgqeblelsbknpc4pw==
Enter this file
Vim ~/.ssh/known_hosts
Delete 10.1.1.61 information about RSA to

Resolve SSH connection too slow