There are no issues with the domain avinashtech.com. It is resolving properly. The issue might be due to the firewall. If your customers are still having problems while accessing the domain, let us know their local IPs so that we can check the firewall for any blocks. Also ask them to provide a traceroute to the server while the issue is there so that we can check for any external network problems. You can take the trace-route result as follows:
In Windows, select Start > Programs > Accessories > Command Prompt.
Enter the word tracert, followed by a space, then the domain name.
eg. tracert avinashtech.com
In Linux, take a shell and type
traceroute avinashtech.com
In Mac,
Open Finder, Applications, Utilities.
Launch the Terminal Application.
Type 'traceroute avinashtech.com' and press enter.