Can't Connect to BBM.

Hi guys, I have a problem with BBM.
Yesterday I went to campus library and connect muly blackberry to its wifi. BBM, WhatsApp, and all internet features worked very well.

Today, I went to the library again and connect my BlackBerry to its wifi again. However, I can connect to everything other than BBM. I thought BBM is error, since it happens alot.
But when I connect to wifi tethered from my tablet, everything is connected including BBM.

And BBM works fine with my carrier data.
Have you guys experienced the same?
Any feedback from you guys. Thanks.

Z3STJ100-1/10.3.1.2576

Posted via CB10

There may be some sort of issue with the Wi-Fi hotspot that you're connecting to. First off, try restarting your device, and if that doesn't clear it up head into Settings > Networks and Connections > Wi-Fi, tap the Saved button at the bottom, remove the saved Wi-Fi network, and then reconnect to it.

I did it. But it still cannot work. It's so weird. Browsing is ok with the same Wifi. I cnman even send WhatsApp and download from BBW. But why BBM doesn't work.

Posted via CB10