due to a hrash of our ipfire server, i installed a new one on another pc.
THe old version was 2.19, the new one is 227.
It mostly works fine but sometime some web sites cannot be reached from
our clients (win10 or android tabs and smartphones)
Its most of the time when the client wants to open a site over the http protocol.
In some cases it works when i open the site with the https protocoll but some time
then an ERR_SSL_PROTOCOL_ERROR occurs.
When i use the old one which had the crash (it mostly crashes after ten minutes online), all works fine.
The proxy settings look good to me. For the sake of clarity: The “transparent” setting of the proxy does not work with HTTPS destinations, since we cannot intercept them transparently (that’s what HTTPS is for, isn’t it? ). As described here, it might be a good idea to force clients using IPFire’s web proxy (if possible), by creating firewall rules denying direct traffic to the internet.
What’s in the logs at the time the ERR_SSL_PROTOCOL_ERROR error occurs? Can you reproduce it by something like curl or wget? If so, please post the log messages here so we can see what goes wrong.
When a browser shows the Err_ssl_protocol_error, it indicates the browser is no longer able to access or initiate the secured communication. There is no definite guide for managing this error. Follow given steps to resolve this error from Client side:
Try correcting the system date and time.
Try clearing Google Chrome browsing data.
Try clearing your SSL State.
Try disabling the QUIC Protocol.
Try checking your antivirus settings.
Try enabling all SSL/TLS versions.
Also, this error is because of the following server side problems:
). As described