topic Re: Error: The underlying connection was closed: could not establish secure connection between SSL/TLS secure channel in Integration, Extension & APIs

Error: The underlying connection was closed: could not establish secure connection between SSL/TLS secure channel

sebHan — Wed, 24 Nov 2021 15:43:28 GMT

Hey, I have a problem with my rest connection API after a new update.

The error I'm getting is:

The following error occurred:

The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. The remote certificate is invalid according to the validation procedure.

The connection have worked before, but now shutdown.

Can anybody explain why this error is occuring?

Best,

Sebastian

Re: Error: The underlying connection was closed: could not establish secure connection between SSL/TLS secure channel

Eduardo_Monteiro — Fri, 10 Mar 2023 00:37:15 GMT

Hello @sebHan

I know this topic is a little bit old, however, I run into this issue lately and want to contribute for future ppl who run into the same issue.

The article below suggest 2 possible root cause for this issue, one refers to internet access to the license backend and the other one is regarding TLS (Transport Layer Security).

Qlik Sense hub fails to connect with: Error reques... - Qlik Community - 1899213

In my case, the issue was related to TLS 1.2 disabled.

This other article is also very helpful to fix this issue: TLS and SSL Support in Qlik Sense: How to configur... - Qlik Community - 1713720

I hope this helps in the future.

BR,

Eduardo Monteiro

Re: Error: The underlying connection was closed: could not establish secure connection between SSL/TLS secure channel

bc5891 — Mon, 11 Sep 2023 09:41:22 GMT

Hi Eduardo, so did you manually change the registry to fix your issue or was it a specific port that is required to be open? Thanks

Re: Error: The underlying connection was closed: could not establish secure connection between SSL/TLS secure channel

Eduardo_Monteiro — Mon, 11 Sep 2023 11:48:53 GMT

Hi @bc5891

You can either do it manually or use IIS crypto.

https://www.nartac.com/Downloads/IISCrypto/IISCrypto.exe

Source: Supported TLS and SSL Protocols and Ciphers - Qlik Community - 1710345

Re: Error: The underlying connection was closed: could not establish secure connection between SSL/TLS secure channel

bc5891 — Mon, 11 Sep 2023 12:21:40 GMT

thanks Eduardo - excuse my ignorance, but is it simply a case of downloading the software and running it or are there other elements to this.

Re: Error: The underlying connection was closed: could not establish secure connection between SSL/TLS secure channel

Eduardo_Monteiro — Mon, 11 Sep 2023 12:44:08 GMT

No worries. Yes, you need to download the tool. Run as admin. Make sure you apply it on every node.

A server reboot might be needed.

Regards,

Re: Error: The underlying connection was closed: could not establish secure connection between SSL/TLS secure channel

bc5891 — Mon, 11 Sep 2023 13:58:07 GMT

Great, thanks so once I run it, it fixes the issue or are there specific steps after running.