Internet Download Manager behind pfsense

  • Hello, I am new to this forum.

    I have done some search about this question and I didn't find any answer, so I decided to create this post.

    I am using IDM (Internet Download Manager) to download files from internet. If I download file using IDM behind pfsense, the IDM can't open simultaneous connection so my download only ended up being 1 connection and it is really so slow. However, if I move to other network where there is no pfsense, I can download same file with 16 simultaneous connection. Is there anyway I can fix it?

    note: I will attach the picture to make it easy to understand

    Thank you
    ![behind pfsense.jpg](/public/imported_attachments/1/behind pfsense.jpg)
    ![behind pfsense.jpg_thumb](/public/imported_attachments/1/behind pfsense.jpg_thumb)
    ![other network.jpg](/public/imported_attachments/1/other network.jpg)
    ![other network.jpg_thumb](/public/imported_attachments/1/other network.jpg_thumb)

  • I don't know the details of how IDM works - perhaps it is not firewall friendly. It might be worth doing a search for IDM and firewall.

    I have no trouble getting multiple concurrent downloads on multiple files on a system downstream of pfSense when I'm using a Linux BitTorrent client.

  • There is nothing in the default config that would have any restrictions on connections. It's impossible to say what's happening from the description provided. Checking any kind of debug logs in your download manager, and getting packet captures from the machine it's running on, would be the next step to get some useful info on what's happening.

  • I forgot to mention, I installed snort IDS/IPS and the rules are default rules. I don't know if this package affect IDM performance.

  • If Snort was having any impact it would completely kill the download, nothing it does would limit the number of connections.

  • I agree with you. I just uninstall it and still I can't see the difference.

  • Update: If I download small file like pdf file which around 2 MB, the IDM can have multiple connection.

  • I hadn't heard of IDM before so I thought I'd give it a try.

    Same big Asterisk download seems to work OK for me.

    ![IDM with pfSense.png](/public/imported_attachments/1/IDM with pfSense.png)
    ![IDM with pfSense.png_thumb](/public/imported_attachments/1/IDM with pfSense.png_thumb)

  • Just a couple potential vectors of investigation:

    What kind of connection do you have?
    The purpose of any sort of IDM is to get optimal overall performance out of a given connection, and sometimes that's indeed one file at a time, particularly on slower connections.
    For similar reasons many browsers restrict downloads to e.g. 3 at a time, and queue up the rest.

    Also these are http downloads, right, not ftp? There is software I know that limits ftp downloads to one connection (maybe something to do with passive ftp), same software does easily multiple http downloads.

  • Finally, I got it work.

    My network is behind pfsense and untangle where untangle act as bridge. I did some research on untangle forum and the problem was the antivirus. Untangle scan every single file that I downloaded through IDM. Because of that scanning process, it prohibit me to have multiple connection. What I did, I just simply turned off the antivirus and now I get no problem with my IDM.

    Thanks for your answer guys, I really appreciate it.

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