Current update of F-Secure causes problems with udp communication

Shelin
Shelin Posts: 9 Observer
in Device Protection

Hi,

i use a VR Headset Meta Quest Pro with steam as PCVR, with streamer steamlink, trying to play VRChat with Face- and Eyetracking via VRCFT software. Communication between the affected modules runs between udp-port 9015/9016 and 9000/9001. But with an update of F-Secure about one or two weeks ago, FT/ET no longer works as intented. The source of the problem is F-Secure, the moment F-Surce is uninstalled, FT/ET run as intended. Somehow, F-Secure messes up teh communication there….

In a discussion within the VRCFT discord channel, it seems that more users have the same problem, rooting back to F-Secure. Just deactivating stuff in F-Secure does not work. Someone mentioned problems with multicast, idk. Is this being worked on or even a known problem? And where can i write an offical ticket for that?

I just renewed my licence, so it is very annoying that i cannot use F-Secure at the moment….

BR

Bernd

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Answers

  • Ville
    Ville Posts: 766 F-Secure Product Expert

    This is not a known issue. Since we don't have that hardware we can't really reproduce the problem here and would need your help to troubleshoot it.

    Please follow these steps:

    1. Open Settings / Support and turn on debug logging
    2. Reproduce the problem with VRChat
    3. Run F-Secure support tool
    4. Send the fsdiag.zip that it creates to me in private message

    I will open a ticket for our team and we will investigate.

    Ville

    F-Secure R&D, Desktop products

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  • Shelin
    Shelin Posts: 9 Observer

    Got the file, but wtf how can I write a private message to you?

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  • TVC15
    TVC15 Posts: 110 Adventurer
    https://community.f-secure.com/en/discussion/comment/140388#Comment_140388

    At least this is how it worked for me. Click on Ville's avatar, and you should get the option to message him.

    send.jpg
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  • Shelin
    Shelin Posts: 9 Observer

    Havent got that option….

    image.png
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  • TVC15
    TVC15 Posts: 110 Adventurer
    edited March 28
    https://community.f-secure.com/en/discussion/comment/140390#Comment_140390

    If you click View Profile, are you able to get this?

    message.jpg

    Otherwise, @Ville could you follow-up with this, please? TIA :)

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  • Shelin
    Shelin Posts: 9 Observer

    No, cant do nothing….I ll wait….

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  • Ville
    Ville Posts: 766 F-Secure Product Expert

    I have asked @Firmy as community manager to help with this issue - I don't know why you can't send private message.

    Ville

    F-Secure R&D, Desktop products

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  • Shelin
    Shelin Posts: 9 Observer

    Any progress yet ? I mean at some point it would be nice to at least know that you work on the issue, which seems not possible if i am not even able to provide the data…..And i cannot use you product at the moment as well, sooo….

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  • jk4k
    jk4k Posts: 2 Observer

    Hi,

    I have the same issue with F-Secure 25.2 update. I have a Windows 10 computer where I have two software communicating with each other using UDP (server IP 127.0.0.1 and port 2237). After the F-Secure updated itself to version 25.2, the communication between those two software stopped. I tried to disable Defender firewall and also temporarily disable F-Secure automatic scanning. No results, UDP communication was still not working. I checked that there was no apps in blocked or quarantine in F-Secure.

    Finally I uninstalled F-Secure. After that, the UDP communication returned back normally and those two software worked as before the F-Secure update. It seems that version 25.2 somehow blocks the UDP.

    BR,

    Jarmo

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  • Shelin
    Shelin Posts: 9 Observer

    I also had to deinstall, because otherwise i cannot work. This is not very satisfiing and nobody here cares about that…..

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  • Firmy
    Firmy Posts: 2,133 Community Manager

    Hello @Shelin @jk4k

    Thank you for your question and comment.

    We regret to hear that you are facing this issue.

    Could you please confirm if you have the latest version of the F-Secure app, version 25.3, installed? [Windows] What's new in the F-Secure app. Kindly ensure the app is updated and try testing again. If the issue persists, please let us know. I will send you a private message to collect a debug log for further investigation.

    Thank you, and have a lovely day.

    Firmy
    Community Manager | F-Secure Community
    🔐 Strengthening digital security through knowledge and collaboration
    🌐 Explore our User Guides | Knowledge Base for self-help resources
    💻 Empower yourself with Cybersecurity Insights and protect what matters

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  • Shelin
    Shelin Posts: 9 Observer

    Hi,

    no, i havent had the current version because its new and I had F-Secure uninstalled, because i am not able to work otherwise. But I just tried with the new version and there is no change for me. It still blocks/messes up communication, so i had to uninstall it again.

    Defender does a good job as well for me at the moment, so no rush….

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  • Firmy
    Firmy Posts: 2,133 Community Manager

    Hello @Shelin

    Thank you for getting back to us.

    As previously requested by @Ville, we kindly ask that you enable debug logging and generate an fsdiag file to help us investigate the issue further. Please follow the steps below:

    1. Open Settings > Support and turn on debug logging.
    2. Reproduce the issue with VRChat.
    3. Run the F-Secure support tool.
    4. Send the generated fsdiag.zip file to me via private message.

    I’ve sent you a private message with further instructions. Please share the fsdiag with us privately.

    Thank you, and have a lovely day.

    Firmy
    Community Manager | F-Secure Community
    🔐 Strengthening digital security through knowledge and collaboration
    🌐 Explore our User Guides | Knowledge Base for self-help resources
    💻 Empower yourself with Cybersecurity Insights and protect what matters

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  • jk4k
    jk4k Posts: 2 Observer

    Hi,

    I have the same problem with both versions 25.2 and 25.3. Currently, I have Fsecure uninstalled because the software prevents the use of my computer for the intended purpose.

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  • Ville
    Ville Posts: 766 F-Secure Product Expert

    We have tried to reproduce this problem but we can't reproduce it so far.

    Could you test if stopping our network filtering driver fixes the issue.

    Once the product is installed, do these steps:

    1. Open command prompt as administrator (elevated)
    2. Run: net stop fsnethoster
    3. Run: net stop fsnifdrv
    4. Run: net start fsnethoster

    This disables network filtering on driver level while keeping browser extensions working. Especially banking protection is pretty useless without driver.

    Let me know if this fixes the issue.

    To return back to normal operating mode you can just reboot or run: net start fsnifdrv

    Ville

    F-Secure R&D, Desktop products

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  • Shelin
    Shelin Posts: 9 Observer

    With fsnethoster down and fsnifdrv down, it works for me. I will send you the diag-file.

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  • Ville
    Ville Posts: 766 F-Secure Product Expert

    I really need to know the situation with fsnethoster up and fsnifdrv down. Can you still check that.

    Ville

    F-Secure R&D, Desktop products

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  • Shelin
    Shelin Posts: 9 Observer

    Following the Test Spec

    Run: net stop fsnethoster
    Run: net stop fsnifdrv
    Run: net start fsnethoster

    It works for me

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