We have source PI server (Plant PI), PItoPI interface and target PI server (Corporate PI). All of them are isolated by firewalls and are in different domains. Majority of tags are collection data smoothly. However, there are a couple of PI tags on corporate PI server whose data is significantly different than data in plant PI. We have checked tag names, instrument tag name, nothing is wrong. On corporate pi server, compressing and exception are turned off. What tools and utility can help me troubleshooting in this case? I have full access to corporate PI server and PIToPI interface server. However, I don't have access to plant pi server.