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RSASSA-PSS in TLS 1.2

I know it is possible to use RSASSA-PKCS1-v1_5 with client certificates in TLS 1.3.
But what about the other way around: using RSASSA-PSS with client certificates in TLS 1.2?

Is it possible to use RSASSA-PSS signed certificates with TLS 1.2 at all? Do I have to fall-back to RSASSA-PKCS1-v1_5 during handshake?

I searched through the RFC5246 but was not able to find anything that answers my questions.

Geth Mismatch of the highestBlock while syncing

While syncing on my Ubuntu 16.04 machine on ropsten yesterday the highestBlock matched the current highestBlock > eth.syncing { currentBlock: 2587196, **highestBlock: 3528808**, knownStates: 3685462, pulledStates: 3676041, startingBlock: 0 } while I had to restart for some reason now when I again start it today I see this. > eth.syncing { currentBlock: 2785412, **highestBlock: 3113093**,::Listen

While syncing on my Ubuntu 16.04 machine on ropsten yesterday the highestBlock matched the current highestBlock

> eth.syncing {   currentBlock: 2587196,   **highestBlock: 3528808**,   knownStates: 3685462,   pulledStates: 3676041,   startingBlock: 0 } 

while I had to restart for some reason now when I again start it today I see this.

> eth.syncing {   currentBlock: 2785412,   **highestBlock: 3113093**,   knownStates: 4120516,   pulledStates: 4113759,   startingBlock: 2729984 } 

The highestBlock has changed. Earlier it was showing the correct highestBlock but now it is showing the incorrect one. Is this normal and will the geth client correct itself on the way ? The syncing is working normally.

System details geth VERSION: 1.8.11-stable-dea1ce05 OS Ubuntu 16.04 

Edit: The synchronisation has stopped at this state and is now stagnant and not progressing.

> eth.syncing {   currentBlock: 3116323,   highestBlock: 3116388,   knownStates: 27269500,   pulledStates: 27259299,   startingBlock: 3116323 } > eth.blockNumber 0 

Is this issue somehow related with this github issue https://github.com/ethereum/go-ethereum/issues/16202

RSASSA-PSS in TLS 1.2

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