Openssl S_client Error 21
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Review Events [ September 27, 2016 ] Unwrapping Tangled Device Configurations openssl verify return code 21 (unable to verify the first certificate) - A10 Networks Edition A10 Networks [ September 13, 2016 ]
Verify Return Code 21 (unable To Verify The First Certificate) Self Signed
This Week: Solarwinds ThwackCamp 2016 Networking Search for: HomeNetworkingFive Essential OpenSSL Troubleshooting Commands Five Essential
Error:num=20:unable To Get Local Issuer Certificate
OpenSSL Troubleshooting Commands March 16, 2015 John Herbert Networking, Software, Tips 2 Troubleshooting SSL certificates and connections? Here are five handy openssl commands that every network
Verify Error:num=27:certificate Not Trusted
engineer should be able to use. Bookmark this - you never know when it will come in handy!1. Check the Connection openssl s_client -showcerts -connect www.microsoft.com:443 12 openssl s_client -showcerts -connect www.microsoft.com:443This command opens an SSL connection to the specified site and displays the entire certificate chain as well. Here’s an abridged version unable to verify the first certificate nodejs of the sample output: MBP$ openssl s_client -showcerts -connect www.microsoft.com:443 CONNECTED(00000003) depth=2 /C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=(c) 2006 VeriSign, Inc. - For authorized use only/CN=VeriSign Class 3 Public Primary Certification Authority - G5 verify error:num=20:unable to get local issuer certificate verify return:0 --- Certificate chain 0 s:/1.3.6.1.4.1.311.60.2.1.3=US/1.3.6.1.4.1.311.60.2.1.2= Washington/businessCategory=Private Organization/ serialNumber=600413485/C=US/postalCode=98052/ST=Washington/ L=Redmond/street=1 Microsoft Way/O=Microsoft Corporation/ OU=MSCOM/CN=www.microsoft.com i:/C=US/O=Symantec Corporation/OU=Symantec Trust Network/ CN=Symantec Class 3 EV SSL CA - G3 -----BEGIN CERTIFICATE----- [...] -----END CERTIFICATE----- 1 s:/C=US/O=Symantec Corporation/OU=Symantec Trust Network/ CN=Symantec Class 3 EV SSL CA - G3 i:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=(c) 2006 VeriSign, Inc. - For authorized use only/CN=VeriSign Class 3 Public Primary Certification Authority - G5 -----BEGIN CERTIFICATE----- [...] -----END CERTIFICATE----- 2 s:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=(c) 2006 VeriSign, Inc. - For authorized use only/CN=VeriSign Class 3 Public Primary Certification Authority - G5 i:/C=US/O=VeriSign, Inc./OU=Class 3 Public Primary Certification Authority -----BEGIN CERTIFICATE----- [...] -----END CERTIFICATE----- --- Server certificate subject=/1.3.6.1.4.1.311.60.2.1.3=US/1.3.6.1.4.1.311.60.2.1.2= Washington/businessCategory=Private Organization/ serialNumber=600413485/C=US/postalCode=98052/ST=Washington/ L=Redmond/street=1 Microsoft Way/O=Microsoft Corporation/OU=MSCOM /CN=www.microsoft.com
Center (ISC) shift, Firefox 3.6.3 (the latest available version) displayed a digital certificate error when accessing the ISC login page through SSL/TLS: openssl verify error 20 https://isc.sans.org/myisc.html. I confirmed this on a couple of Firefox instances running on verify return code: 21 (unable to verify the first certificate) comodo Mac OS X and Windows XP. We also got a few reports from ISC readers on the openssl unable to get local issuer certificate same issue, although other people running the same browser version, and even language (EN), on the same OS platforms, didn't get any error message. Finally, the reason was a http://movingpackets.net/2015/03/16/five-essential-openssl-troubleshooting-commands/ new ISC digital certificate had been recently installed, and the required intermediate certificate was missing in some web browsers. As a result, the browser couldn't validate the full digital certificate chain to ensure you were really connecting to the website you intended to connect to. This is a common scenario on security incidents, where Man-in-the-Middle (MitM) attacks or http://blog.taddong.com/2010/04/manual-verification-of-ssltls.html direct web server breaches modify the SSL/TLS certificate offered to the victim, and when accidentally accepted, the attacker can intercept and modify the "secure" HTTPS channel. As you may find yourself dealing with a similar situation in the future... how can you (as I did) check what is the real reason behind the SSL/TLS certificate validation error? By manually verifying the SSL/TLS certificate trust chain, or certificate hierarchy, through openssl. The goal is to manually follow all the validation steps that are commonly performed it an automatic way by the web browser. Step 1: Check the certificate validation error and download the controversial digital certificate. $ openssl s_client -connect isc.sans.org:443 depth=0 /C=US/postalCode=20814/ST=Maryland/L=Bethesda/streetAddress=Suite 205/streetAddress=8120 Woodmont Ave/O=The SANS Institute/OU=Network Operations Center (NOC)/OU=Comodo Unified Communications/CN=isc.sans.org verify error:num=20:unable to get local issuer certificate verify return:1 depth=0 /C=US/postalCode=20814/ST=Maryland/L=Bethesda/streetAddress=Suite 205/streetAddress=8120 Woodmont Ave/O=The SANS Institute/OU=Network Operations Center (NOC)/OU=Comodo Unified Communications/CN=isc.sans.org verify error:num=27:certificate not trusted verify return:1 depth=0 /C=US/postalCode=20814/ST=Maryland/L=Bethesda/streetAddress=Suite 205/streetAddress=8120 Woodmont Ave/O=The SANS Institute/OU=Network Operations Center (NOC)/OU=Comodo Unified Communications/CN=isc.sans.org verify error:num=21:unable to verify the first certificate verify return:1 CONNECTED(00000003) --- Certif
if you have installed hMailServer and want to ask a question related to a production release of hMailServer. Before posting, please read the troubleshooting guide. A large part of https://www.hmailserver.com/forum/viewtopic.php?t=27662 all reported issues are already described in detail here. Post Reply Print https://bbs.archlinux.org/viewtopic.php?id=182706 view Search Advanced search 7 posts • Page 1 of 1 Clipper87 New user Posts: 23 Joined: 2011-09-20 16:34 chained certificate issue Quote Postby Clipper87 » 2015-01-16 22:30 I am using a RapidSSL certificate for smtp on port 465 SSL. When I check the certificate with openssl unable to using:openssl-win64\bin\openssl s_client -showcerts -connect mail.mydom.be:465I get the following response (see below) and here's my questions:Question 1: I don't understand why the response says depth=0 ?Question 2: I don't understand why error 20,27 & 21 are shown ?Furthermore you have to know that my server only gets mail via SSL on port 465 from GMAIL & from external servers via to verify the port 25. I did hash the RapidSLL CA Bundle and renamed it with the hash.0 & put that in C:\Program Files (x86)\hMailServer\Externals\CA Question 3: Is it even necessary for me to create that file & put it in C:\Program Files (x86)\hMailServer\Externals\CA if I'm not using hMailserver to pull mail from other servers ?Question 4: In the response just above the line containing "No client certificate CA names sent" it seems that the certificate is working correctly or am I wrong ?Thank you!Loading 'screen' into random state - doneCONNECTED(0000017C)depth=0 OU = GT48139417, OU = See http://www.rapidssl.com/resources/cps (c)15, OU = Domain Control Validated - RapidSSL(R), CN = mail.mydom.beverify error:num=20:unable to get local issuer certificateverify return:1depth=0 OU = GT48139417, OU = See http://www.rapidssl.com/resources/cps (c)15, OU = Domain Control Validated - RapidSSL(R), CN = mail.mydom.beverify error:num=27:certificate not trustedverify return:1depth=0 OU = GT48139417, OU = See http://www.rapidssl.com/resources/cps (c)15, OU = Domain Control Validated - RapidSSL(R), CN = mail.mydom.beverify error:num=21:unable to verify the first certificateverify return:1---Certificate chain 0 s:/OU=GT48139417/OU=See http://www.rapidssl.com/resources/cps (c)15/OU=Domain Control Validated - RapidSSL(R)/CN=mail.mydom.be i:/C=US/O=GeoTrust Inc./CN=RapidSSL SHA256 CA - G3-----BEGIN CERTIFICATE-----MIIEoTCCA4mgAwIBAgIDAavmMA0GCSqGSIb3DQEBCwUAMEcxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1HZW9UcnVzdCBJbmMuMSAwHgYDVQQDExdSYXBpZFNTTCBTSEEyNTYgQ0EgLSBHMzAeFw0xNTAxMTQyMDMzMTdaFw0xODAzMTgwMDI3MTJaMIGRMRMwEQYDVQQLEwpHVDQ4MTM5NDE3MTE
1 #1 2014-06-11 17:22:37 3wen Member Registered: 2014-06-11 Posts: 5 [Solved] OfflineIMAP, OpenSSL and untrusted certificate Hi,I am going through some issues configuring OfflineIMAP.One of my email accounts is hosted on a server whose certificate is not valid, openssl s_client -showcerts -connect