Needs help with certificate

Hi!

I'm calling an external webservice using a Call HTTP atom and gets the error:

<Payload Role="C" id="atom_call_login" statusNo="HTTP" statusMsg="" reference="atom_login" sysid="" payload="atom_login" throwException="false">

<http.header/>

<httaError xmlns="urn:com.sap.b1i.xcellerator:upltdoc" HTTPcode="" HTTPmsg="">

<exceptionMsg>

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

</exceptionMsg>

<returnData/>

</httaError>

</Payload>

The call is made over https with the following settings:

• destProtocol = https
• destHost = login.salesforce.com
• destPort = 443
• destPath = XXX

The url https://login.salesforce.com shows the following certificate-chain:

• login.salesfoce.com (SSL, sha256)
• VeriSign Class 3 Public Primary Certification Authority - G5 (sh1)

1. First I made the call with no certificates imported. Got the error above.
2. I imported the root certificate "VeriSign Class 3 Public Primary Certification Authority - G5" into Tomcat keystore. Got the same error.
3. I imported the SSL certificate as well. Same error.

I think that only the root certificate needs to exist in the keystore. That is also what the exception tells me (I think).

Please I need help getting this issue solved!

Regards

Lars