Connect to SQL Server through IP address

Here are couple more things you can try.

Check if sql server is configured to listen on that IP address. If your server has multiple IP addresses that doesn’t necessarily mean that it can automatically accept connections from all IPs.

To set this go to SQL Server Configuration Manager -> SQL Server Network Configuration -> Protocols for {instancename} -> TCP/IP -> IP addresses tab

Here is also some info that will guide you when setting up firewall.
What you want to do with the firewall is to enable TCP and UDP traffic on port 1433 for both incoming and outgoing traffic.

http://www.howtogeek.com/112564/how-to-create-advanced-firewall-rules-in-the-windows-firewall/

Now, if you have physical firewall or some other software firewall other than windows default you’ll have to contact your network admin

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