There are most common issues which can happen (users report):

• can't reach internet
• server is unresponsible

Most important is to realize what can it cause and what resource userst are trying to reach.

possible issues:

• internet line is down (or any switch / router on the line)
• DNS servers are unresponsible

at client computer where is internet inaccessible I need to make sure about next questions:

• is computer in my network? (mostly: network address, gateway, DNS servers) : India

  ipconfig /all

  • FALSE: Is main router accessible? Is DHCP running? Have DHCP free IP addresses?
• is my gateway responsible?

  ping <gtw-ip-address>

  • FALSE: Is router stucked? Is some Switch on the way broken?
• is my internet line responsible?

  ping <my-public-ip>

  • FALSE: Isn't change in some firewall rule?
• is some IP address in internet responsible?

  ping 1.1.1.1

• is my DNS responsible?

  ping <my-dns-ip-address>

When is false only last question, you need to troubleshoot DNS servers. That is external service and is substituble.

For work our systems there is need our internal DNS - usually on IP address finish with 5 - 10.0.???.5

Check your DNS server:

ping <my-dns-ip-address>

When is unresponsible, you can use (for work internet addresses at least) public DNS servers like:

• 1.1.1.1
• 8.8.8.8
• 8.8.4.4

or some from your internet provider

There is important realize location of this server - local vs remote (USA)

possible issues - local server:

• something is stucked on the server
• HW issue

It isn't fortigate issue

possible issues - remote server:

• my internet line up
• remote internet line up
• VPN is connected
• Static Routes status