Comodo blocks fragmented UDP traffic When Block Fragmented traffic is off [M974]

A. THE BUG/ISSUE (Varies from issue to issue)
[ol]- Can U reproduce the problem & if so how reliably?:

  • If U can, exact steps to reproduce. If not, exactly what U did & what happened:
    1:Check that option “Block fragmented traffic” is off
    2:start analysis using
    3:Find the following item in results’ summary: “Fragmented UDP traffic is blocked”
  • If not obvious, what U expected to happen:
    Obviously Comodo should not block fragmented traffic
  • If a software compatibility problem have U tried the conflict FAQ?:
  • Any software except CIS/OS involved? If so - name, & exact version:
  • Any other information, eg your guess at the cause, how U tried to fix it etc:
    Comodo is the cause of the problem. As soon as I disable the firewall component the site no longer reports that fragmented UDP traffic is blocked.

[ol]- Exact CIS version & configuration:
Problem spotted since version 6

  • Modules enabled & level. D+/HIPS, Autosandbox/BBlocker, Firewall, & AV:
    Firewall: Custom Ruleset
    Autosandbox: Disabled
    HIPS: Safe Mode
  • Have U made any other changes to the default config? (egs here.):
  • Have U updated (without uninstall) from CIS 5 or CIS6?:
    [li]if so, have U tried a a clean reinstall - if not please do?:
    Tried with version 6 - it did not help.
    [/li]- Have U imported a config from a previous version of CIS:
    [li]if so, have U tried a standard config - if not please do:

[/li]- OS version, SP, 32/64 bit, UAC setting, account type, V.Machine used:
WIndows 7 Ultimate SP1 64 bit, UAC disabled, Administrator account

  • Other security/s’box software a) currently installed b) installed since OS, including initial trial security software included with system:

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Thank you for reporting this issue. I think it will also be helpful if you could attach your exported configuration to your first post. Let me know when you have done that.



Thank you very much for your report in standard format, with all information supplied. The care you have taken is much appreciated by Comodo, and will increase the likelihood that this bug can be fixed.

Developers may or may not communicate with you in the forum or by PM/IM, depending on time availability and need. Because you have supplied complete information they may be able to replicate and fix the bug without doing so.

Many thanks again.

Hi cmd user,

Devs have marked this issue as “Fixed”. Please verify.


The devs have marked this as fixed. I will therefore move this to Resolved.

If this is still happening on your computer please respond and let me know.

Thank you.