# Err\_ssl\_protocol\_error **URL:** \ **Category:** Pritunl Zero\ **Created:** [April 13, 2023, 9:47am UTC](https://forum.pritunl.com/t/err-ssl-protocol-error/956 "2023-04-13T09:47:31Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![hooble](https://forum.pritunl.com/letter_avatar_proxy/v4/letter/h/c68b51/32.png) [@hooble](https://forum.pritunl.com/u/hooble)\ **Post date:** [April 13, 2023, 9:47am UTC](https://forum.pritunl.com/t/err-ssl-protocol-error/956/1 "2023-04-13T09:47:31Z")
Hi @zach I am running a single instance of Pritunl Zero to access several internal HTTP services. There are several admins changing the configuration (e.g. adding new services). Twice I had a strange behaviour: one admin added an additional service and this somehow broke Pritunl Zero completely. When I tried to access the web interface afterwards, all I got was a browser error saying: the site sent an invalid response - ERR\_SSL\_PROTOCOL\_ERROR. So all I could do was restoring the VM from backup. Since then everything has been fine. I managed to keep the disk with the invalid state and I would like to find out, what exactly happened (I think it is just a user error). Could you give me some pointers on which log files to look in? Just looking at the error, I suspect it has something to do with the TLS certificate. Is it possible to reset the TLS settings over CLI? Thanks ---
**Author:** ![zach](https://forum.pritunl.com/user_avatar/forum.pritunl.com/zach/32/1105_2.png) [@zach](https://forum.pritunl.com/u/zach)\ **Post date:** [April 13, 2023, 6:14pm UTC](https://forum.pritunl.com/t/err-ssl-protocol-error/956/2 "2023-04-13T18:14:15Z")
The command `sudo pritunl-zero reset-id` can be used to clear the host ID. This will create a new host and clear the host configuration. The settings can then be copied over from the old host in the hosts tab. ---
**Author:** ![hooble](https://forum.pritunl.com/letter_avatar_proxy/v4/letter/h/c68b51/32.png) [@hooble](https://forum.pritunl.com/u/hooble)\ **Post date:** [April 17, 2023, 1:00pm UTC](https://forum.pritunl.com/t/err-ssl-protocol-error/956/3 "2023-04-17T13:00:44Z")
Thanks a lot. I will try this, if this error happens again. Is it also possible to temporarly switch the admin node to HTTP over the `pritunl-zero` - command? ---
**Author:** ![zach](https://forum.pritunl.com/user_avatar/forum.pritunl.com/zach/32/1105_2.png) [@zach](https://forum.pritunl.com/u/zach)\ **Post date:** [April 17, 2023, 4:34pm UTC](https://forum.pritunl.com/t/err-ssl-protocol-error/956/4 "2023-04-17T16:34:06Z")
There’s no commands that would change node options. ---
**Author:** ![ellymarins](https://forum.pritunl.com/letter_avatar_proxy/v4/letter/e/49beb7/32.png) [@ellymarins](https://forum.pritunl.com/u/ellymarins)\ **Post date:** [September 11, 2025, 12:09pm UTC](https://forum.pritunl.com/t/err-ssl-protocol-error/956/5 "2025-09-11T12:09:54Z")
The error [ERR\_SSL\_PROTOCOL\_ERROR](https://certera.com/blog/how-to-fix-ssl-handshake-failed-error/) occurs when a secure connection between a server and a client fails to establish. If you are familiar with the SSL Handshake process or using an SSL certificate, you must understand why such an issue occurred on your system. There can be many different reasons for the error, such as:- - Incorrect Date and Time settings - Invalid SSL/TLS Certificate - Incorrect Cipher Suite Selection - Interference with the SSL handshake by firewalls or proxies - Network connectivity Many different ways to fix the error, which can help solve the error.