AdGuard + AdGuard VPN certificate issue on dtf.ru

### Please answer the following questions for yourself before submitting a question.

- [X] I am running the latest version
- [X] I checked the [knowledge base](https://adguard.com/kb/) and found no answer
- [X] I checked to make sure that this issue has not already been filed

### Ask a question

Related to: https://github.com/AdguardTeam/AdguardFilters/issues/187494
Username: @irrijnmun
### Issue URL (Ads)
[https://dtf.ru/](https://adguardteam.github.io/AnonymousRedirect/redirect.html?url=https%3A%2F%2Fdtf.ru%2F)

### Screenshots

Screenshot 1


### System configuration

Information | Value
--- | ---
AdGuard product: | AdGuard for Windows v7.18.1 (4778)
System version: | Microsoft Windows NT 10.0.22631.0
Browser: | Firefox
License type: | paid
AdGuard driver: | WFP
Tracking protection options: | Block WebRTC,
Block Push API,
Block Location API,
Block Flash,
Strip URLs from tracking parameters,
Hide your search queries,
Send Do-Not-Track header,
Hide your Referrer from third-parties (dtf.ru),
Hide your User-Agent,
Remove X-Client-Data header from HTTP requests,
Protect against DPI,
Self-destructing third-party cookies (180),
Block trackers,
Disable WAP Push Message Routing Service,
Disable Windows Defender automatic samples submission,
Disable Windows Telemetry,
Turn off Advertising ID
DNS filtering: | server: `https://dns.adguard-dns.com/dns-query`
filters: `https://filters.adtidy.org/windows/filters/15.txt`, `User rules`
Filters: | Ad Blocking:
AdGuard Base

Privacy:
AdGuard URL Tracking,
AdGuard Tracking Protection

Social Widgets:
AdGuard Social Media

Annoyances:
AdGuard Annoyances

Language-specific:
AdGuard Russian
Browsing Security: | enabled
Browsing Security statistics: | enabled
Userscripts: | https://userscripts.adtidy.org/release/adguard-extra/1.0/adguard-extra.user.js
https://userscripts.adtidy.org/release/popup-blocker/2.5/popupblocker.user.js
Other extensions used: | Нет

### Import issue configuration (AdGuard for Windows)
[Import](https://adguardteam.github.io/AnonymousRedirect/redirect.html?url=adguard%3Aimport_user_configuration%3Fbrowsing_security.enabled%3Dtrue%26browsing_security.statistics_enabled%3Dtrue%26dns.custom_bootstrap%3D%26dns.custom_fallback%3D%26dns.enabled%3Dtrue%26dns.fallback_mode%3DSystem%26dns.filters%3Dhttps%253A%252F%252Ffilters.adtidy.org%252Fwindows%252Ffilters%252F15.txt%252CUser%2Brules%26dns.filters_enabled%3Dtrue%26dns.servers%3Dhttps%253A%252F%252Fdns.adguard-dns.com%252Fdns-query%26dns.timeout%3D0%26filters%3D14.17.1.2.3.4%26license_type%3Dpaid%26parental_control.enabled%3Dfalse%26product_type%3DWin%26product_version%3D7.18.1%2B%25284778%2529%26referrer%3D%26stealth.DNT%3Dtrue%26stealth.block_third_party_auth%3Dfalse%26stealth.block_trackers%3Dtrue%26stealth.disable_third_party_cache%3Dfalse%26stealth.disable_wap_push_message_routing_service%3Dtrue%26stealth.disable_windows_defender%3Dtrue%26stealth.disable_windows_telemetry%3Dtrue%26stealth.dpi%3Dtrue%26stealth.enabled%3Dtrue%26stealth.flash%3Dtrue%26stealth.hide_search_queries%3Dtrue%26stealth.java%3Dfalse%26stealth.location%3Dtrue%26stealth.push%3Dtrue%26stealth.referrer%3Ddtf.ru%26stealth.strip_url%3Dtrue%26stealth.third_party_cookies%3D180%26stealth.turn_off_advertising_id%3Dtrue%26stealth.webrtc%3Dtrue%26stealth.x_client%3Dtrue%26system_version%3DMicrosoft%2BWindows%2BNT%2B10.0.22631.0%26url%3Dhttps%253A%252F%252Fdtf.ru%252F%26user_agent%3DMozilla%252F5.0%2B%2528Windows%2BNT%2B10.0%253B%2BWin64%253B%2Bx64%253B%2Brv%253A129.0%2529%2BGecko%252F20100101%2BFirefox%252F129.0%26userscripts%3Dhttps%253A%252F%252Fuserscripts.adtidy.org%252Frelease%252Fadguard-extra%252F1.0%252Fadguard-extra.user.js%252Chttps%253A%252F%252Fuserscripts.adtidy.org%252Frelease%252Fpopup-blocker%252F2.5%252Fpopupblocker.user.js%26win.wfp%3Dtrue)