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[GH-ISSUE #1766] Unable to load website after connecting to CISCO - AnyConnect VPN #1758

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opened 2026-03-03 19:54:06 +03:00 by kerem · 4 comments

kerem commented

2026-03-03 19:54:06 +03:00

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Originally created by @Bellaposa on GitHub (Sep 11, 2023).
Original GitHub issue: https://github.com/ProxymanApp/Proxyman/issues/1766

Originally assigned to: @NghiaTranUIT on GitHub.

Description

Website loading issues arise when using Proxyman in conjunction with CISCO - AnyConnect VPN.

Steps to Reproduce

Launch Proxyman.
Initiate VPN connection through CISCO - AnyConnect.
Open a browser.
Attempt to access a website, or Application e.g., https://google.com., Microsoft Teams The site/app fails to load

Current Behavior

I'm able to intercept only the data coming from the VPN server, such as intranet pages and associated content. Yet, when I attempt to search on Google, the page doesn't load.

Using just the VPN, websites load without issues. However, challenges occur when Proxyman and AnyConnect are run together.

Expected Behavior

The website should load without any hindrance.

Environment

App version: Proxyman 4.10.0
macOS version: Ventura 13.4.1 (22F82)

Originally created by @Bellaposa on GitHub (Sep 11, 2023). Original GitHub issue: https://github.com/ProxymanApp/Proxyman/issues/1766 Originally assigned to: @NghiaTranUIT on GitHub. ## Description Website loading issues arise when using Proxyman in conjunction with CISCO - AnyConnect VPN. ## Steps to Reproduce 1. Launch Proxyman. 2. Initiate VPN connection through CISCO - AnyConnect. 3. Open a browser. 4. Attempt to access a website, or Application e.g., https://google.com., Microsoft Teams The site/app fails to load ## Current Behavior I'm able to intercept only the data coming from the VPN server, such as intranet pages and associated content. Yet, when I attempt to search on Google, the page doesn't load. Using just the VPN, websites load without issues. However, challenges occur when Proxyman and AnyConnect are run together. ## Expected Behavior The website should load without any hindrance. ## Environment - App version: Proxyman 4.10.0 - macOS version: Ventura 13.4.1 (22F82) <img width="536" alt="Screenshot 2023-09-11 at 15 39 56" src="https://github.com/ProxymanApp/Proxyman/assets/16580320/a6f4cf3c-2499-4d41-b239-ec4aaf05b37f"> <img width="671" alt="Screenshot 2023-09-11 at 15 43 34" src="https://github.com/ProxymanApp/Proxyman/assets/16580320/23325021-abda-46f3-8c0e-8b398d48b1e6">

kerem added the

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2026-03-03 19:54:06 +03:00

kerem commented

2026-03-03 19:54:07 +03:00

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@NghiaTranUIT commented on GitHub (Sep 11, 2023):

Hi, it's because the Cisco VPN doesn't accept any proxy server (Proxyman), so you get the error.

To fix it, please follow this docs: https://docs.proxyman.io/troubleshooting/proxyman-does-not-work-with-vpn-apps#3.-anyconnect

Some users can make both Proxyman and AnyConnect VPN work 👍

@NghiaTranUIT commented on GitHub (Sep 11, 2023): Hi, it's because the Cisco VPN doesn't accept any proxy server (Proxyman), so you get the error. To fix it, please follow this docs: https://docs.proxyman.io/troubleshooting/proxyman-does-not-work-with-vpn-apps#3.-anyconnect Some users can make both Proxyman and AnyConnect VPN work 👍

kerem commented

2026-03-03 19:54:07 +03:00

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@Bellaposa commented on GitHub (Sep 11, 2023):

Hello,

Thank you for getting back to me. I followed the guide to the letter, but the problem persists. It's odd because I had been using the Proxyman app smoothly until about 20 days ago. After updating to version 4.10.0, it stopped working. I even attempted to revert to an older version, but, curiously, that doesn’t seem to work anymore either.

On a side note, I don’t encounter this issue with other tools I use.

@Bellaposa commented on GitHub (Sep 11, 2023): Hello, Thank you for getting back to me. I followed the guide to the letter, but the problem persists. It's odd because I had been using the Proxyman app smoothly until about 20 days ago. After updating to version 4.10.0, it stopped working. I even attempted to revert to an older version, but, curiously, that doesn’t seem to work anymore either. On a side note, I don’t encounter this issue with other tools I use.

kerem commented

2026-03-03 19:54:07 +03:00

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@jeffery812 commented on GitHub (Oct 18, 2023):

Same here. I am able to load my employer's website only, but not google.com, and Teams cannot login either.

@jeffery812 commented on GitHub (Oct 18, 2023): Same here. I am able to load my employer's website only, but not google.com, and Teams cannot login either.

kerem commented

2026-03-03 19:54:07 +03:00

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@Bellaposa commented on GitHub (May 30, 2024):

Hello!

After extensive investigation, it was found that running the command sudo pfctl -d after connecting to the VPN resolves the blocking issue. This command disables the packet filter.

It seems that MacOS Sonoma has a bug in Firewall More info

Please note that you will need to run this command each time you connect to the VPN.

While this may not be the most ideal solution, it currently helps to bypass the problem.

Hope this helps!

@Bellaposa commented on GitHub (May 30, 2024): Hello! After extensive investigation, it was found that running the command `sudo pfctl -d` after connecting to the VPN resolves the blocking issue. This command disables the packet filter. It seems that MacOS Sonoma has a bug in Firewall [More info](https://www.reddit.com/r/mullvadvpn/comments/16hpqp8/bug_in_macos_14_sonoma_prevents_our_app_from/ ) Please note that you will need to run this command each time you connect to the VPN. While this may not be the most ideal solution, it currently helps to bypass the problem. Hope this helps!