Socket not opening(evaluateServerTrust method won't return anything)

[pothinenikarthik-plivo]

We included Pocketsocket.a file inside our objective c framework. The socket connection is not opening sometimes. We debugged inside PocketSocket code, we found that evaluateServerTrust method is called in a synchronous way by executeDelegateAndWait.
PocketSocket code:
[self executeDelegateAndWait:^{
customTrustEvaluation = [_delegate respondsToSelector:@selector(webSocket:evaluateServerTrust:)];
}];

We changed synchronous to asynchronous by calling executeDelegate and everything worked fine. What is the reason in calling evaluateServerTrust method in a synchronous way?