TCP Denied (Squid)

Hi

The Nethserver working normally in 2 buildings of the company and unexpectedly began to feel the slow internet.
Checking the squid logs showed a lot of error TCP_DENIED / 407.
And after a long time the message
ERR_TUNNEL_CONNECTION_FAILED

:-/

it occurs with IE browser

We are using the chrome here.

Hello,

Nas has right. The Chrome Proxy settings are related to IE.
The error is from proxy settings.
Is a combination of how to set Web Proxy on NS and Proxy settings on Chrome, IE, Firefox.