Yahoo messenger not connecting... Please Help !!!!

Hi,

 

I have a strange problem, I am able to connect to internet and even have MSN messenger working. but somehow yahoo messenger never connects.

 

It use to work earlier. then one day it was blocked by my windows firewall and i think i hit on "keep blocking" option.

 

I have tried to set exceptions on firewall to allow YPager.exe to connect to internet.

 

I have tried with all connection options in yahoo but no luck...

 

Can someone help me out with this. I do not want to reinstall operating system.

 

Please Help !!!!!

 

Thanks

 

PD