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Hi,

let's start from the back ;-). 

> Oliver: you can probably confirm this by trying to trick GFAL to using your client certificate and not a proxy.

indeed, that works!



> What version is the redirector?

In the logs I provided, both instances ran on the same machine, and both used the 5.0.1 binaries. That was on CentOS 8, i.e. openssl-1.1.1c. 
However, the earlier tests showing the same issue also covered the combinations:
- Redirector running 4.12.3 with OpenSSL 1.0.2k (CentOS 7), data server running 5.0.1 with OpenSSL 1.0.2k (CentOS 7). 
- Both the redirector and data server running 5.0.1 with OpenSSL 1.0.2k (CentOS 7). 

Both were affected, too. The error "looked the same", I could of course also try to catch logs, but that would take a bit (would then reproduce in our test setup). 



> So, relative to (b) you can test the hypothesis that it's the elliptic ciphers that are causing the problem by including the directive in the R5 server:  {{http.cipherfilter ALL:!LOW:!EXP:!MD5:!MD2}}

Since it also happened in the 5.0.1 <=> 5.0.1 combination on a single node with two instances, this is probably nought — I still tried it, but the error remains. 

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