It’s more likely that curl 7.64.1 succeeds to connect while openssl 2.8.3 fails with alert number 40 (see below). It might be related to the server which has several virtual hosts. openssl 3.0.5 (mp) seems to handle it fine compared to openssl 2.8.3.
Downloads $ openssl version OpenSSL 3.0.5 5 Jul 2022 (Library: OpenSSL 3.0.5 5 Jul 2022) Downloads $ openssl s_client -connect wias-berlin.de:443 -servername wias-berlin.de CONNECTED(00000005) depth=3 C = DE, O = T-Systems Enterprise Services GmbH, OU = T-Systems Trust Center, CN = T-TeleSec GlobalRoot Class 2 verify return:1 depth=2 C = DE, O = Verein zur Foerderung eines Deutschen Forschungsnetzes e. V., OU = DFN-PKI, CN = DFN-Verein Certification Authority 2 verify return:1 depth=1 C = DE, O = Verein zur Foerderung eines Deutschen Forschungsnetzes e. V., OU = DFN-PKI, CN = DFN-Verein Global Issuing CA verify return:1 depth=0 C = DE, ST = Berlin, L = Berlin, O = Forschungsverbund Berlin e.V., OU = Weierstrass-Institut f. Angewandte Analysis u. Stochastik (WIAS), OU = RT, CN = www.wias-berlin.de verify return:1 Downloads $ /usr/bin/openssl version LibreSSL 2.8.3 Downloads $ /usr/bin/openssl s_client -connect wias-berlin.de:443 -servername wias-berlin.de CONNECTED(00000005) depth=3 C = DE, O = T-Systems Enterprise Services GmbH, OU = T-Systems Trust Center, CN = T-TeleSec GlobalRoot Class 2 verify return:1 depth=2 C = DE, O = Verein zur Foerderung eines Deutschen Forschungsnetzes e. V., OU = DFN-PKI, CN = DFN-Verein Certification Authority 2 verify return:1 depth=1 C = DE, O = Verein zur Foerderung eines Deutschen Forschungsnetzes e. V., OU = DFN-PKI, CN = DFN-Verein Global Issuing CA verify return:1 depth=0 C = DE, ST = Berlin, L = Berlin, O = Forschungsverbund Berlin e.V., OU = Weierstrass-Institut f. Angewandte Analysis u. Stochastik (WIAS), OU = RT, CN = www.wias-berlin.de verify return:1 4381900460:error:14008410:SSL routines:CONNECT_CR_KEY_EXCH:sslv3 alert handshake failure:/System/Volumes/Data/SWE/macOS/BuildRoots/880a0f6e74/Library/Caches/com.apple.xbs/Sources/libressl/libressl-56.60.4/libressl-2.8/ssl/ssl_pkt.c:1200:SSL alert number 40 4381900460:error:140080E5:SSL routines:CONNECT_CR_KEY_EXCH:ssl handshake failure:/System/Volumes/Data/SWE/macOS/BuildRoots/880a0f6e74/Library/Caches/com.apple.xbs/Sources/libressl/libressl-56.60.4/libressl-2.8/ssl/ssl_pkt.c:585: --- Mark > On Jul 18, 2022, at 8:11 AM, Mark Brethen <mark.bret...@gmail.com> wrote: > > wias-berlin.de <http://wias-berlin.de/>
