Hi Jason,

Actually is more strange, and I do not exclude a diameter problem or an issue with my environment now.
The P forwards the REGISTER to the I , I to the S , S sends back 401 back to the I , and then it arrives at the P , and then on UE. Then UE sends REGISTER again (challenge/response) but this second REGISTER does make it past the I , nothing comes back from the I , and then the P generates a 504 Server Time-out which is being sent to UE.
Funny thing is that when I restart the P (and not the I !) , registration starts to function normally again.
I could not reproduce today . I will send some logs from last week to your email if it's okay with you.

Dragos

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