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This post helps or guide you in fixing all issues related to punchout.
1. When user click over the punchout link, and in the detailed exception message you see "CONNECTION REFUSED"
Solution : telnet <punchout/supplier site> 443 in oracle applications oacore & apache server, it will be unsuccessful . Check with Firewall team, is there any network port block for that site from oracle applications oacore or apache server.
2. When user click over the punchout link, and in the detailed exception message you see "No Trusted Certificate found"
Solution: 1. Check with Supplier is the certificate key got changed, get the valid certificate from supplier, export it as .base64 certificate and get it in .txt format.
2. Get the absolute file path of the certificates file , that stores the certificates' names , in Profile "POR :CA Certificate File Name".
The certificate file is located at tech_st directory structure: /.../apps/tech_st/10.1.2/sysman/config/b64InternetCertificate.txt
3. append the ceritificate to the beginning of the file mentioned in profile POR :CA Certificate File Name), Ensure to append it in the beginning of file. "Append only the trusted certificates". 4. Bounce the apache and oacore services. --Narasimha Rao