I was right! After hours of testing and troubleshooting with my ISP network engineers, we have determined that it is nothing on my end and all seems to originate from the pcper forums IP address. It seems that so show my IP address range was blocked from accessing /newpost.php and if I attempt enough, I get a connection refused message. Odd thing is this all happened after I started posting about mumble and ArmA 2:-D
I'm posting from work ATM.