Steps and errors:

In our NON PROD Environment
 
1) Wanted to test the salesforce sandbox,  We tried without changing anything.
Error:
Unable to invoke endpoint URI "https://test.salesforce.com/services/Soap/c/38.0/0DF16000000ATqX" successfully due to: javax.xml.soap.SOAPException: javax.xml.soap.SOAPException: Message send failed: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 
2) Applied test.salesforce.com cert  
Error:
BusinessFault : {urn:enterprise.soap.sforce.com}LoginFault. Client received SOAP Fault from server : INVALID_LOGIN: Invalid username, password, security token; or user locked out.
 
3) Provided our the sandbox credentials
Error:
Unable to invoke endpoint URI "https://cs52.salesforce.com/services/Soap/c/38.0/00D5B000000DECd/0DF16000000ATqX" successfully due to: javax.xml.soap.SOAPException: javax.xml.soap.SOAPException: Message send failed: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 
4) Applied wc.cs52.force.com.12132020.crt
Error:
Unable to invoke endpoint URI "https://cs52.salesforce.com/services/Soap/c/38.0/00D5B000000DECd/0DF16000000ATqX" successfully due to: javax.xml.soap.SOAPException: javax.xml.soap.SOAPException: Message send failed: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 
 
5) Applied wc.cs52.force.com.12132020.crt  
Error:
Unable to invoke endpoint URI "https://cs52.salesforce.com/services/Soap/c/38.0/00D5B000000DECd/0DF16000000ATqX" successfully due to: javax.xml.soap.SOAPException: javax.xml.soap.SOAPException: Message send failed: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 
----
6) Changed the https://test.salesforce.com/services/Soap/c/38.0/0DF16000000ATqX to https://certtest.force.com/services/Soap/c/38.0/0DF16000000ATqX
Error:
Unable to invoke endpoint URI "https://certtest.force.com/services/Soap/c/38.0/0DF16000000ATqX" successfully due to: javax.xml.soap.SOAPException: javax.xml.soap.SOAPException: Message send failed: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 

 

As of Winter 18' the following apex class no longer works.  I am not a developer, we do not have one on staff, nor do we have premier support so this is my last hope.  Any thoughts are graciously appreciated.  What this did is allow our customer care reps to delete leads only when doing so as part of the merge process.  Now the just get the error message in the trigger each time 'You are not authorized to delete leads'.

Hello,

Our Informatic team are suddenly getting the following error when running their nightly job to pull data from Salesforce.  It worked fine up unitl Sunday night.  I am not a developer and am not sure what to suggest for them.  Any suggestions are welcome.  Thanks all!

User gets, "You have sent us an Illegal URL or an improperly formatted request." error when clicking on three different visualforce buttons.  When I log in as the users all three buttons work as expected.  Why would the user get those errors, but I do not?  The user deleted cookies, cache and restarted yesterday when it first occured.  That fixed the error.  Coming back in today the error is occuring again.  Thanks for any ideas.  

As of Winter 18' the following apex class no longer works.  I am not a developer, we do not have one on staff, nor do we have premier support so this is my last hope.  Any thoughts are graciously appreciated.  What this did is allow our customer care reps to delete leads only when doing so as part of the merge process.  Now the just get the error message in the trigger each time 'You are not authorized to delete leads'.