Chrome always ERR_CONNECTION_CLOSED

[LegendNoobz]

Please answer the following questions for yourself before submitting an issue

• [X] Filters were updated before reproducing an issue
• [X] I checked the knowledge base and found no answer
• [X] I checked to make sure that this issue has not already been filed

AdGuard version

7.18.1

Browser version

128.0.6613.138

OS version

Windows 10, 22H2

Traffic filtering

• [X] yes, I do

Ad Blocking

AdGuard Base filter

Privacy

AdGuard Tracking Protection filter, AdGuard URL Tracking filter

Social

No response

Annoyances

AdGuard Annoyances filter, AdGuard Cookie Notices filter, AdGuard Popups filter, AdGuard Other Annoyances filter

Security

No response

Other

No response

Language-specific

No response

Which DNS server do you use?

AdGuard DNS

DNS protocol

DNS-over-HTTPS

Custom DNS

No response

What Stealth Mode options do you have enabled?

No response

Support ticket ID

No response

Issue Details

Just use the same settings like me

Expected Behavior

Open a website without facing error in chrome

Actual Behavior

Every website i opened, return with "ERR_QUIC_PROTOCOL" or "ERR_CONNECTION_CLOSED"

Screenshots

Screenshot 1

Additional Information

i'm getting this error with AdGuard. After looking for solution, i try 1 settings "Use redirect driver mode" and this solved my issue. But, i don't want to change any settings in "Advanced Setting". Can you help to search other solution?

[AlexandrPkhm]

Hi @LegendNoobz

Could you please let us know if you are using any antivirus software and especially Bitdefender?

[AlexandrPkhm]

@LegendNoobz Please let us know if there are any news on the issue?

[LegendNoobz]

@AlexandrPkhm Hello, i'am using bitdefender. the issue still exist if i turn off the driver feature in adguard

[AlexandrPkhm]

@LegendNoobz This is a known issue which is related to Bitdefender. To utilise AdGuard alongside Bitdefender please follow the steps outlined in the previously resolved issue https://github.com/AdguardTeam/AdguardForWindows/issues/5215.

Please let us know if the issues persists after that.

[LegendNoobz]

I want to know something, what's the difference between turning on redirect driver mode with turning off it feature? Just want to know the pros and cons before turn it off encrypted web scan in BitDefender. Because i don't wanna turn off any feature on my AV ( If it's the only way to make it smooth, i wil turn off )

[AlexandrPkhm]

@LegendNoobz The difference comes to the following:

If Redirect driver mode is enabled, AdGuard intercepts all the traffic and redirects it to the local proxy server for further filtering. Otherwise, AdGuard will filter all the traffic on the fly, without redirection. In this case, the system will consider AdGuard to be the sole application that connects to the Internet (other applications are routed through it). The downside is that it will make the system Firewall less effective. The upside is that this approach works a little bit faster.

However, Redirect driver mode has nothing to do with this particular issue. In this case, Bitdefender distrusts AdGuard certificate used for filtering and this causes the ERR_QUIC_PROTOCOL" or "ERR_CONNECTION_CLOSED" errors in browser.