Python Socket给OSError：打开的文件太多。即使关闭插座

Question

这是代码，

def get_local_ip():    
    try:
        # doesn't even have to be reachable
        s.connect(('10.255.255.255', 1))
        ip = s.getsockname()[0]
    except Exception as err:
        ip = '127.0.0.1'
    finally:
        s.close()
    return ip

我收到OSError：文件过多错误，如果我在wsgi服务器中调用此函数。我不太确定为什么会这样，因为我要关闭Socket。