can't reach zoho.com or mail.zoho.com

can't reach zoho.com or mail.zoho.com

Hello
We can't reach zoho.com or mail.zoho.com.
in some cases dns server can't resolve the IP or when I use 4.2.2.4 and resolve the IP address can't reach the server:

Tracing route to mail.zoho.com [8.40.222.102]
over a maximum of 30 hops:

  1     7 ms     3 ms     3 ms  192.168.43.1
  2     *        *        *     Request timed out.
  3     *        *       47 ms  10.136.20.241
  4    31 ms    50 ms    47 ms  10.136.20.246
  5    34 ms    28 ms    26 ms  10.136.24.225
  6   280 ms   331 ms   286 ms  10.137.214.217
  7    35 ms    36 ms    32 ms  10.137.214.218
  8    38 ms    54 ms    31 ms  10.137.208.33
  9    41 ms    43 ms    42 ms  10.137.208.38
 10    40 ms    39 ms    44 ms  10.21.249.10
 11    61 ms    58 ms    51 ms  85.132.90.237
 12     *        *        *     Request timed out.
 13   109 ms   107 ms   115 ms  ae58.bar1.Stockholm1.Level3.net [212.73.250.241]
 14     *        *        *     Request timed out.
 15     *        *        *     Request timed out.
 16     *        *        *     Request timed out.
 17     *        *        *     Request timed out.
 18     *        *        *     Request timed out.
 19     *        *        *     Request timed out.
 20     *        *        *     Request timed out.
 21     *        *        *     Request timed out.
 22     *        *        *     Request timed out.
 23     *        *        *     Request timed out.
 24     *        *        *     Request timed out.
 25     *        *        *     Request timed out.
 26     *        *        *     Request timed out.
 27     *        *        *     Request timed out.
 28     *        *        *     Request timed out.
 29     *        *        *     Request timed out.
 30     *        *        *     Request timed out.

Trace complete.

I can open zoho.eu, but from there I can't login to Zoho mail,
When entering email details on login page it show a message on top of login:
No network found.Please connect to Internet

Best reagrds
Mehdi