- Which firmware version you were using before upgrading to 1.9.0?
- What is your ER h/w model?
If h/w model is ER-X then you should disable "ipsec-offload" because of is causing problems with L2TP. This issue has been discussed here -> https://community.ubnt.com/t5/EdgeMAX/Problems-with-L2TP-Client-stays-connected-but-can-only-load/m-p/1748525#M138432
If your model is not ER-X then please post your config.