Which Firewall Port Should I Keep Open For Webclient.Downloadfileasync Method

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C#

ASP.NET

C#4.0

firewall

Hello Experts

I am using webclient.DownloadFileAsync method and it works perfectly on my local host, but when I deploy it on server I can not able to download file from remote computer
Let me explain you in detail
I have a remote machine hosted on internet and from that machine I want to download some files, for that I have used 'webclient.DownloadFileAsync', it works on local host perfectly but when I deploy it on server I can not able to download file and if I disabled my Firewall then it works perfectly.
Now my question is what exact ports we need to open to download file from remote machine using webclient.DownloadFileAsync method

Thanks