Je ne résout pas le pb pour les autres sites concernés (attention, même si le service OCSP Stapling est entièrement tombé, seuls les sites qui ont demandé le renouvellement sont impactés)
Par contre cela résout le pb pour mon serveur.
iperf.fr, est lui aussi avec OCSP Stapling avec Let's Encrypt et il n'est pour le moment pas impacté :
$ openssl s_client -connect iperf.fr:443 -status -servername iperf.fr
CONNECTED(00000003)
OCSP response: no response sent
depth=2 O = Digital Signature Trust Co., CN = DST Root CA X3
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
verify return:1
depth=0 CN = iperf.fr
verify return:1
---
Certificate chain
0 s:/CN=iperf.fr
i:/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
1 s:/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
i:/O=Digital Signature Trust Co./CN=DST Root CA X3
---
Server certificate
-----BEGIN CERTIFICATE-----
MIIFIDCCBAigAwIBAgISA+98NKHhFn0XUXihJMxZ/I3sMA0GCSqGSIb3DQEBCwUA
MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD
ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xNzA1MTQxMDU4MDBaFw0x
NzA4MTIxMDU4MDBaMBMxETAPBgNVBAMTCGlwZXJmLmZyMIIBIjANBgkqhkiG9w0B
AQEFAAOCAQ8AMIIBCgKCAQEAyaS7UG2dHdGoYucb3Vc8jKUT8CFH6b8uQ2cusm3A
hfoz5Ytf5vSOUGQRQxGxGYoaNsL5BbrYc6ZQfM0Z7j/Jvy7EISJ80g+lXBDgwaR8
XvO3FwY4kHlPVPQunxvG+4XI77hIpz//HWu2otxKE3st672ui67+SAXP/NPoej/o
Y5agiiwteRoKSnJi8OEd4jJHnsDxQyLm8+Q9PaKvCzEDQZyAvEz+Lu3JjoSCy/Gl
cmELl36fUkLihTN2N5tyL5uw9/p8x9aFk5Q5Asu+bt1gnCITjXUzrBYuKCHITJhH
yy4jBZHc5c2rQoI3dUAJuvQsPBVpDRdZUDIrlzj1ciNkOwIDAQABo4ICNTCCAjEw
DgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAM
BgNVHRMBAf8EAjAAMB0GA1UdDgQWBBSACwEO9agPJqdsCRBYiW5NzEr2KDAfBgNV
HSMEGDAWgBSoSmpjBH3duubRObemRWXv86jsoTBwBggrBgEFBQcBAQRkMGIwLwYI
KwYBBQUHMAGGI2h0dHA6Ly9vY3NwLmludC14My5sZXRzZW5jcnlwdC5vcmcvMC8G
CCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQteDMubGV0c2VuY3J5cHQub3JnLzA/
BgNVHREEODA2gghpcGVyZi5mcoINaXB2NC5pcGVyZi5mcoINaXB2Ni5pcGVyZi5m
coIMd3d3LmlwZXJmLmZyMIH+BgNVHSAEgfYwgfMwCAYGZ4EMAQIBMIHmBgsrBgEE
AYLfEwEBATCB1jAmBggrBgEFBQcCARYaaHR0cDovL2Nwcy5sZXRzZW5jcnlwdC5v
cmcwgasGCCsGAQUFBwICMIGeDIGbVGhpcyBDZXJ0aWZpY2F0ZSBtYXkgb25seSBi
ZSByZWxpZWQgdXBvbiBieSBSZWx5aW5nIFBhcnRpZXMgYW5kIG9ubHkgaW4gYWNj
b3JkYW5jZSB3aXRoIHRoZSBDZXJ0aWZpY2F0ZSBQb2xpY3kgZm91bmQgYXQgaHR0
cHM6Ly9sZXRzZW5jcnlwdC5vcmcvcmVwb3NpdG9yeS8wDQYJKoZIhvcNAQELBQAD
ggEBAI87Sn0TukwTiev+rZRem3Vmq92qzponIad/GMxqdhFiVVvozJ8KoUuFPv76
Ohclc1kHlpojuWWQPj2lMjy3iJZeZDc35IjIBbwtD2jEDZeHtgPEphU2v6KHHKc7
VZmS7Zv406rdSAs8zGw7yFJWdoZRuAQXr2USLZqgoBDf0h1L9jTjUtb/eDyhu1c1
6qM488SXv1qHgZqBIyI5Zzyq/wVexahasMiUbetPoz+fJojsVF690iHuvXE6YeV5
HsvCSx6Jf7d9py9ebvrjQpLZcN0nZxX/vpTMx24tF+Qo6pi9O00YUm2HlhHbFV4K
47EcezYnr1gozFOwyliqvMiaGFQ=
-----END CERTIFICATE-----
subject=/CN=iperf.fr
issuer=/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
---
No client certificate CA names sent
Peer signing digest: SHA512
Server Temp Key: ECDH, P-256, 256 bits
---
SSL handshake has read 3188 bytes and written 457 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
Protocol : TLSv1.2
Cipher : ECDHE-RSA-AES128-GCM-SHA256
Session-ID: 934B3587359851ECE1F1952B7532A00E9D6819A493D4113C0C5DABF926A5B527
Session-ID-ctx:
Master-Key: 7CD0F4EE10700CAE9CFB27720B1EA19A00D6E05B7849E016FADBBAEBB59CB8F20B0C8EE2D6AB71983483DA6263D66E12
Key-Arg : None
PSK identity: None
PSK identity hint: None
SRP username: None
TLS session ticket lifetime hint: 300 (seconds)
TLS session ticket:
0000 - 15 6e cc 64 75 83 36 40-71 d3 25 c8 74 27 ae 7c .n.du.6@q.%.t'.|
0010 - 0d 5e 0c a8 8a 43 b7 c9-6d ed 95 40 c8 08 e0 de .^...C..m..@....
0020 - 9f 6c 86 fd 05 62 b4 f3-ff dc 9e e1 3c 0a e7 ab .l...b......<...
0030 - f1 89 7a e3 de 7a 60 10-86 c3 3f c5 65 25 f4 b3 ..z..z`...?.e%..
0040 - 17 3f a7 b5 f1 d7 1b 75-3b 49 83 cd d1 2e d9 8e .?.....u;I......
0050 - a8 09 8a 16 9b 49 59 3a-28 5e 8c 43 c6 07 85 20 .....IY:(^.C...
0060 - 17 71 a9 50 fb 13 fe e1-19 1e 0e 15 45 c8 6b 40 .q.P........E.k@
0070 - e4 9c 55 b6 76 fb 0e cf-ee 50 c3 09 74 1c d2 33 ..U.v....P..t..3
0080 - 22 5f 12 a7 29 47 3b 25-95 e4 60 fc 00 ab ff 5e "_..)G;%..`....^
0090 - 97 39 00 dc 3e 96 6a 77-39 b9 63 af 9d f9 72 2f .9..>.jw9.c...r/
00a0 - b8 a1 68 a7 f0 c7 33 05-79 e7 64 c9 5d 87 e5 58 ..h...3.y.d.]..X
00b0 - 98 25 1b b4 67 62 39 95-d7 c1 fc 2d a8 8c ee be .%..gb9....-....
Start Time: 1495197647
Timeout : 300 (sec)
Verify return code: 0 (ok)
---