Android phone wi-fi not connecting with perticular network only

Please refer me to right portal if this is not a right one. I am having android phone HTC one +. Now problem is that when i am in office and trying to connect with Wi-Fi then it not connect but when i try to connect with any other Wi-Fi network then it easily connect. I also had visit the service center and Wi-Fi connected easily in their network. What i can do to solve this issue.