There are multiple causes to this problem. 
 
You're just going to have to read through all the previous posts already on this topic to understand the causes and solutions. 
 
I reccomend you start with the few sticky posts on the subject and work from there. 
 
I will say this, generally it has to do with network settings. 
		
	
		
		
		
		
		
		
			
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				~ Xarslik 
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