ERPNext Access Issue

Dear Community,

I have just install ERPNext on Google cloud, with Domain Name and SSL.

I can able to access erp but sometimes it says Couldn’t connect to the server in Browser.
and same time i use erpnext on another Device in that i can able to access erp.

after 1 hour it works on both device. This is the log file of fail2ban. can anyone please help me, Meanwhile when i checked on https://dnschecker.org my ip resolving or not
in some location it has been resolved and still pending in some location, i have setup dns 4 days ago.

2019-03-20 08:41:22,700 fail2ban.filter [8327]: INFO Set jail log file encoding to UTF-8
2019-03-20 08:41:22,700 fail2ban.filter [8327]: INFO Set findtime = 600
2019-03-20 08:41:22,701 fail2ban.filter [8327]: INFO Set maxRetry = 6
2019-03-20 08:41:22,704 fail2ban.filter [8327]: INFO Added logfile = /var/log/nginx/access.log
2019-03-20 08:41:22,716 fail2ban.jail [8327]: INFO Jail ‘sshd’ started
2019-03-20 08:41:22,721 fail2ban.jail [8327]: INFO Jail ‘nginx-proxy’ started
2019-03-20 08:47:01,390 fail2ban.filter [8327]: INFO Log rotation detected for /var/log/nginx/access.log
2019-03-20 08:56:20,764 fail2ban.filter [8327]: INFO [nginx-proxy] Found 5.8.10.202
2019-03-20 09:37:28,062 fail2ban.filter [8327]: INFO [nginx-proxy] Found 113.89.6.242
2019-03-20 09:37:28,711 fail2ban.filter [8327]: INFO [nginx-proxy] Found 113.89.6.242
2019-03-20 09:37:29,167 fail2ban.filter [8327]: INFO [nginx-proxy] Found 113.89.6.242
2019-03-20 09:47:06,563 fail2ban.filter [8327]: INFO [nginx-proxy] Found 5.8.10.202
2019-03-20 10:59:44,156 fail2ban.filter [8327]: INFO [sshd] Found 141.98.81.81
2019-03-20 17:35:42,548 fail2ban.filter [8327]: INFO [sshd] Found 113.195.164.240
2019-03-20 22:38:46,611 fail2ban.filter [8327]: INFO [sshd] Found 76.227.15.50
2019-03-20 22:38:46,869 fail2ban.filter [8327]: INFO [sshd] Found 76.227.15.50
2019-03-21 07:18:38,181 fail2ban.filter [8327]: INFO [sshd] Found 14.187.37.86
2019-03-21 07:51:57,036 fail2ban.filter [8327]: INFO [nginx-proxy] Found 91.202.188.68
2019-03-21 13:42:24,603 fail2ban.filter [8327]: INFO [sshd] Found 96.67.112.219
2019-03-21 13:53:27,279 fail2ban.filter [8327]: INFO [sshd] Found 121.219.114.211
2019-03-21 16:59:36,056 fail2ban.filter [8327]: INFO [sshd] Found 31.13.204.98
2019-03-21 18:04:43,744 fail2ban.filter [8327]: INFO [sshd] Found 141.98.81.81
2019-03-21 19:41:52,914 fail2ban.filter [8327]: INFO [nginx-proxy] Found 157.230.103.42
2019-03-21 20:00:09,444 fail2ban.filter [8327]: INFO [sshd] Found 141.98.81.81
2019-03-21 20:59:53,611 fail2ban.filter [8327]: INFO [sshd] Found 202.137.154.80
2019-03-22 00:58:02,039 fail2ban.filter [8327]: INFO [nginx-proxy] Found 66.240.205.34
2019-03-22 01:19:45,591 fail2ban.filter [8327]: INFO [nginx-proxy] Found 198.20.99.130
2019-03-22 01:19:46,536 fail2ban.filter [8327]: INFO [nginx-proxy] Found 198.20.99.130
2019-03-22 01:19:46,880 fail2ban.filter [8327]: INFO [nginx-proxy] Found 198.20.99.130
2019-03-22 01:19:47,427 fail2ban.filter [8327]: INFO [nginx-proxy] Found 198.20.99.130
2019-03-22 01:19:50,930 fail2ban.filter [8327]: INFO [nginx-proxy] Found 198.20.99.130
2019-03-22 01:19:54,543 fail2ban.filter [8327]: INFO [nginx-proxy] Found 198.20.99.130
2019-03-22 01:19:54,666 fail2ban.actions [8327]: NOTICE [nginx-proxy] Ban 198.20.99.130
2019-03-22 01:29:55,387 fail2ban.actions [8327]: NOTICE [nginx-proxy] Unban 198.20.99.130
2019-03-22 02:01:45,315 fail2ban.filter [8327]: INFO [sshd] Found 73.162.65.136
2019-03-22 02:01:45,384 fail2ban.filter [8327]: INFO [sshd] Found 73.162.65.136
2019-03-22 02:15:09,572 fail2ban.filter [8327]: INFO [sshd] Found 213.200.139.124
2019-03-22 02:15:17,846 fail2ban.filter [8327]: INFO [sshd] Found 213.200.139.124
2019-03-22 04:26:55,297 fail2ban.filter [8327]: INFO [sshd] Found 222.221.140.200
2019-03-22 04:42:41,480 fail2ban.filter [8327]: INFO [sshd] Found 89.64.39.8
2019-03-22 04:49:36,095 fail2ban.filter [8327]: INFO [sshd] Found 89.64.39.8
2019-03-22 05:03:06,122 fail2ban.filter [8327]: INFO [sshd] Found 89.64.39.8
2019-03-22 05:06:29,978 fail2ban.filter [8327]: INFO [sshd] Found 89.64.39.8

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