[malfoy_G_PIR]

Hello friend, i need a help,

I have a wireless TP-link router at the my job, i want to connect to a internet by WiFi, but when i push CONNECT there appears down right side of monitor on the WiFi symbol a yellow triangular with ,,!'' symbol. what is it? how can i fix that problem? That TP-link router pluged to the modem to get a internet. please help me to fix it. Thanks in advance.