Client Test Tool: Failed to connect Error

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Hi All,

I'm trying to use the Client Test Tool to perform some checks in DataMiner, but I encounter the following error: "Failed to connect. Error: The underlying connection was closed. Could not establish a trust relationship for the SSL/TLS secure channel."

Can i know how to fix this issue? Thank you in advance.

Jeeva Suria Rajah [SLC] [DevOps Enabler] Selected answer as best 19th October 2023
Ive Herreman [SLC] [DevOps Catalyst] commented

Hi Jeeva,

Are you using a self-signed certificate?
Can you try to check the no connection checking box in the attribute section?
Jeeva Suria Rajah [SLC] [DevOps Enabler] commented

Hi Ive,

I’m not using a self-signed certificate, and I’ve already checked the “no connection checking” option, but still no luck in connecting.
Bert Buysschaert [SLC] [DevOps Enabler] commented

It may not be a self-signed certificate, but there may be another trust issue (i.e. untrusted root CA or intermediate CA, or hostname in the certificate not matching with the supplied hostname). Can you retrieve https://server/ConnectionSettings.txt in a browser without certificate warnings?
Simon Raine [SLC] [DevOps Enabler] commented

Just to note that this came up before and just a reinstall of IIS solved it. It seems that this error can pop up for plenty of reasons that are difficult to pinpoint.

1 Answer

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12.18K 1 Comment

Hi Jeeva,

Can you try to disable the auto-discover and tick the "specify port" checkbox?

Jeeva Suria Rajah [SLC] [DevOps Enabler] Selected answer as best 19th October 2023
Jeeva Suria Rajah [SLC] [DevOps Enabler] commented

Hi Ive, if i disable the auto-discover and tick the “specify port” checkbox, i can access the Client Test tool then. Thank you!!
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