Author Topic: Avast Premium Security - DNS problem  (Read 1032 times)

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Offline Leona9

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Avast Premium Security - DNS problem
« on: November 10, 2021, 02:10:28 PM »
Dobrý den,
zjistili jsme zajímavý problém, který je způsoben aktivními štíty Avast Premium Security. Ve společnosti máme vlastní DNS server, který překládá na lokální síti doménovou adresu mail.xxxx.cz na lokální IP adresu. Tj. uživatelé lokálně přistupují na mail server přes lokální IP adresu, ne přes veřejnou IP. Na všech PC (kde není instalován AVAST) funguje bez problému, ale po instalaci nového PC (Windows 11) s instalací Avast Premium Security nastal problém, že překlad adresy nefunguje správně. Při dotazu na zmíněnou doménou adresu to na daném PC vrací veřejnou IP adresu a né lokální, která je předávána lokálním DNS serverem. Všimli jsme si, že pokud deaktivujeme všechny štíty AVASTu a znovu je aktivujeme, překlady fungují správně, ale po restartu PC je problém zpět a zmíněnou akci musíme opakovat. Prosím o vyřešení tohoto problému. Díky


Offline Asyn

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Re: Avast Premium Security - DNS problem
« Reply #1 on: November 10, 2021, 03:15:10 PM »
Please post English here, else use the forum section for your language.
-> Non-English Zone: https://forum.avast.com/index.php#c7
Win 8.1 [x64] - Avast PremSec 22.1.6886.IBC [UI.688] - EEK - Firefox ESR 91.5 [NS/uBO/PB] - TB 91.5.0
Avast-Tools: Secure Browser 97.1 - Cleanup 21.4 - SecureLine 5.15 - Driver Updater 21.4 - CCleaner 5.88
Avast Wissenswertes (Downloads, Anleitungen & Infos): https://forum.avast.com/index.php?topic=60523.0

Offline Leona9

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Re: Avast Premium Security - DNS problem
« Reply #2 on: November 10, 2021, 04:06:47 PM »
Hello,
We have discovered an interesting problem caused by active Avast Premium Security shields. In our company we have our own DNS server that resolves the domain address mail.xxxx.cz on the local network to a local IP address. That is, users locally access the mail server via the local IP address, not the public IP. On all PCs (where AVAST is not installed) it works without any problem, but after installing a new PC (Windows 11) with Avast Premium Security installed, the problem occurred that the address translation does not work correctly. When querying the domain address mentioned, it returns the public IP address on that PC and not the local IP address that is passed by the local DNS server. We noticed that if we deactivate all AVAST shields and reactivate them, the translations work correctly, but after rebooting the PC the problem is back and we have to repeat the mentioned action. Please solve this problem. Thanks

Offline r@vast

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Re: Avast Premium Security - DNS problem
« Reply #3 on: November 11, 2021, 10:53:05 AM »
Hello,
We have discovered an interesting problem caused by active Avast Premium Security shields. In our company we have our own DNS server that resolves the domain address mail.xxxx.cz on the local network to a local IP address. That is, users locally access the mail server via the local IP address, not the public IP. On all PCs (where AVAST is not installed) it works without any problem, but after installing a new PC (Windows 11) with Avast Premium Security installed, the problem occurred that the address translation does not work correctly. When querying the domain address mentioned, it returns the public IP address on that PC and not the local IP address that is passed by the local DNS server. We noticed that if we deactivate all AVAST shields and reactivate them, the translations work correctly, but after rebooting the PC the problem is back and we have to repeat the mentioned action. Please solve this problem. Thanks

Hi,

Can you please disable "Real Site" and let us know if it helps (Protection > Real Site).

Offline Leona9

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Re: Avast Premium Security - DNS problem
« Reply #4 on: November 11, 2021, 11:26:26 AM »
Hello,
yes shield "Real sites" causes this problem. Can you please tell me how we can make an exception for a certain domain so that we don't have to have this shield permanently disabled?

For larger companies and corporations this kind of local translation may be common practice. In this case mentioned protection shield from AVAST is unusable.

Thank you for any solutions
« Last Edit: November 11, 2021, 11:29:06 AM by Leona9 »

Offline r@vast

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Re: Avast Premium Security - DNS problem
« Reply #5 on: November 11, 2021, 11:51:13 AM »
Hello,
yes shield "Real sites" causes this problem. Can you please tell me how we can make an exception for a certain domain so that we don't have to have this shield permanently disabled?

For larger companies and corporations this kind of local translation may be common practice. In this case mentioned protection shield from AVAST is unusable.

Thank you for any solutions

Hi,

Please see this guide: https://support.avast.com/en-ww/article/Antivirus-Real-Site-FAQ/#idt_070