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Mozilla Firefox slows down when disconnecting from VPN GlobalProtect

Candlejack
Candlejack
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I use Mozilla Firefox for work. Part of my work requires I use the GlobalProtect VPN client. When I log on to the VPN, everything appears to be fine. The problem arises when I log out of the VPN client, such as needing to switch to a different VPN.

When I log out of the VPN client, Mozilla slows down massively. I get the following errors when trying to access websites.

PR_END_OF_FILE Timeout

I thought it was a DNS issue, but the change I made previously did not prove to be a reliable fix, and I do not actually know the root cause of what is happening. Firefox returns to normal ONLY after a full computer restart. At this point I am considering switching browsers as, despite Firefox's functionality, it is starting to interfere with my work.

I have used other VPNs, such as Fortigate VPN, and not encountered anything like this.

Any advice or guidance would be appreciated.

I use Mozilla Firefox for work. Part of my work requires I use the GlobalProtect VPN client. When I log on to the VPN, everything appears to be fine. The problem arises when I log out of the VPN client, such as needing to switch to a different VPN. When I log out of the VPN client, Mozilla slows down massively. I get the following errors when trying to access websites. PR_END_OF_FILE Timeout I thought it was a DNS issue, but the change I made previously did not prove to be a reliable fix, and I do not actually know the root cause of what is happening. Firefox returns to normal ONLY after a full computer restart. At this point I am considering switching browsers as, despite Firefox's functionality, it is starting to interfere with my work. I have used other VPNs, such as Fortigate VPN, and not encountered anything like this. Any advice or guidance would be appreciated.

Chosen solution

The solution: It was a specific website I was visiting when disconnecting from the VPN. Specifically I have a vCenter dashboard at the other end of the tunnel, and I have gone multiple days disconnecting from the VPN.

However all symptoms disappeared once I no longer kept the vCenter dashboard open. I think the dashboard was interacting with firefox in a bad way, especially as it requires an on-prem DNS server for routing. Once that tunnel is gone, it beats the browser into the ground and prevents it from functioning. I do not know if this needs to be elevated to the devs or not.

Either way I am closing out my question.

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All Replies (2)

Candlejack
Candlejack Question owner
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Update: I waited about an hour and it seems the issue has resolved on its own? Was the browser waiting for something that the VPN disconnect interrupted?

Helpful?

Candlejack
Candlejack Question owner
more options

Chosen Solution

The solution: It was a specific website I was visiting when disconnecting from the VPN. Specifically I have a vCenter dashboard at the other end of the tunnel, and I have gone multiple days disconnecting from the VPN.

However all symptoms disappeared once I no longer kept the vCenter dashboard open. I think the dashboard was interacting with firefox in a bad way, especially as it requires an on-prem DNS server for routing. Once that tunnel is gone, it beats the browser into the ground and prevents it from functioning. I do not know if this needs to be elevated to the devs or not.

Either way I am closing out my question.

Helpful?

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