How Can I Block Incoming Connections

If you don't mind with the solution not being an app, then you can use iptables. They are included in the AOSP kernel. You can access them by downloading a terminal app off of the app store. You might however need root for this.

The usage of iptables on android should be same as the ones on desktop Linux, so you can look up some GNU manual for it.

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idowu

• To configure Firewall on a mobile device:

• Open the window with the settings of the policy for managing devices.
• In the policy Properties: <Policy name> window, select the Manage Samsung KNOX U94; Manage Samsung devices section.
• In the Firewall window, click Settings.The Firewall window opens.
• Select the Firewall mode:
  • To allow all inbound and outbound connections, move the slider to Allow all.
  • To block all network activity except that of apps on the list of exclusions, move the slider up to Block all but exceptions.
• If you have set the Firewall mode to Block all but exceptions, create a list of exclusions:
  • Click Add.This opens the Exclusion for Firewall window.
  • In the App name field, enter the name of the mobile app.
  • In the Package name field, enter the system name of the mobile app package
  • Click OK.
• Click the Apply button to save the changes you have made.
• Mobile device settings are configured after the next device synchronization with the Kaspersky Security Center.

https://play.google.com/store/apps/details?id=com.lostnet.fw.free

To disallow all incoming data connections with the Windows Firewall, click Start, type firewall and click Windows Firewall > Change notification settings. Under Public network settings, tick Block all incoming connections, including those in the list of allowed programs, then OK.

To disallow all incoming data connections with the Windows Firewall, click Start, type firewall and click Windows Firewall > Change notification settings. Under Public network settings, tick Block all incoming connections, including those in the list of allowed programs, then OK.