digi.log on connectport x2e gateway

hi,
i found unknow ip access my gateway.How can i block it?

###digi.log
Jun 3 08:14:55 (none) authpriv.info dropbear[1177]: Child connection from 115.231.219.29:3303
Jun 3 08:14:55 (none) authpriv.info dropbear[1178]: Child connection from 115.231.219.29:3318
Jun 3 08:28:11 (none) authpriv.info dropbear[1285]: Child connection from 198.13.101.86:3304
Jun 3 08:28:13 (none) authpriv.info dropbear[1286]: Child connection from 198.13.101.86:3357
Jun 3 08:35:05 (none) authpriv.info dropbear[1354]: Child connection from 115.231.219.31:2366
Jun 3 08:35:05 (none) authpriv.info dropbear[1355]: Child connection from 115.231.219.31:2386

Have you tried activating the “Enable the firewall for the mobile network interface” option under the Mobile Firewall menu?