While starting the new extract processes, the extracts were getting abended with below error
2018-05-10 17:32:00 ERROR OGG-02022 Logmining server does not exist on this Oracle database.
2018-05-10 17:32:00 ERROR OGG-01668 PROCESS ABENDING.
Solution :There is an easy solution for this. You need to login to the database through GGSCI prompt and register the extract. This should get your extracts started
GGSCI > dblogin userid guser password LKJFSDKLJFLASDJLKSDJF
GGSCI > register extract extract1, database
GGSCI > start extract1
Hope this resolves your issue.