FPN configuration after Producer System Refresh

We have configured FPN based on EP7 as consumer and BI7.0 as producer in our test environment. Both of them are at same SPS13 level. Last week, after we refreshed our BI system only from production data, the FPN connectivity seems to have been lost.

From my consumer, it shows that I am registered on the producer. But when i directly log into BI portal, I don't see my EP system as registered consumer. I can no longer see any of the remote content from consumer.

I tried to unregister my consumer, but the system will not allow and gives error message ""Could not unregister your portal. Possible reasons: producer server is down, network problems, or incorrect registration parameters"

But my producer is up and strange thing is I can create a new connection to producer, register with same parameters but different ID. Using this connection, I can search and assign remote content from Producer.

Secondly - I order to delete my existing producer, do I first have to unregister it? Since it would not allow me to unregister, I tried deleting, but the process keeps looping at 50% and does nothing.

Any help on this issue will be highly appreciated. Thank!