Diskussion:TLS/Zertifikat überprüfen: Unterschied zwischen den Versionen
Die Seite wurde neu angelegt: „= TMP = ==Using online checkers== ===Check SSL using online tools=== * [https://www.htbridge.com/ssl/ ImmuniWeb® SSLScan] * [https://www.sslshopper.com/ssl-checker.html SSL Checker - SSL Certificate Verify] * [https://www.ssllabs.com/ssltest/ SSL Server Test (Powered by Qualys SSL Labs)] ===Using a Linux server=== * Any Linux server can be used for these tests. If you do not have a Linux server, use the online checkers above. * To verify SSL, connect t…“ |
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==== POP3 via SSL uses port 995 ==== | ==== POP3 via SSL uses port 995 ==== | ||
Connect to a mail server using openssl: | Connect to a mail server using openssl: | ||
openssl s_client -showcerts -connect mail.example.com:995 | openssl s_client -showcerts -connect mail.example.com:995 -servername mail.example.com | ||
Check output and make sure that a valid certificate is shown: | Check output and make sure that a valid certificate is shown: | ||
Server certificate | Server certificate | ||
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====SMTP via SSL uses port 465==== | ====SMTP via SSL uses port 465==== | ||
Connect to a mail server using openssl: | Connect to a mail server using openssl: | ||
openssl s_client -showcerts -connect mail.example.com:465 | openssl s_client -showcerts -connect mail.example.com:465 -servername mail.example.com | ||
Check output and make sure that a valid certificate is shown: | Check output and make sure that a valid certificate is shown: | ||
Server certificate | Server certificate | ||
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Make sure that you received SMTP server response: | Make sure that you received SMTP server response: | ||
220 mail.example.com ESMTP Postfix | 220 mail.example.com ESMTP Postfix | ||
==== SMTP via TLS/StartTLS uses port 25 or 587 ==== | ==== SMTP via TLS/StartTLS uses port 25 or 587 ==== | ||
Connect to a mail server using openssl: | Connect to a mail server using openssl: | ||
openssl s_client -starttls smtp -showcerts -connect mail.example.com:25 | openssl s_client -starttls smtp -showcerts -connect mail.example.com:25 -servername mail.example.com | ||
Check output and make sure that a valid certificate is shown: | Check output and make sure that a valid certificate is shown: | ||
Aktuelle Version vom 14. Juni 2026, 00:46 Uhr
TMP
Using online checkers
Check SSL using online tools
- ImmuniWeb® SSLScan
- SSL Checker - SSL Certificate Verify
- SSL Server Test (Powered by Qualys SSL Labs)
Using a Linux server
- Any Linux server can be used for these tests. If you do not have a Linux server, use the online checkers above.
- To verify SSL, connect to any Linux server via SSH and use the instructions below:
IMAP via SSL uses port 993
- connect to a mail server using openssl:
openssl s_client -showcerts -connect mail.example.com:993 -servername mail.example.com
Check output and make sure that a valid certificate is shown:
Server certificate subject=/OU=Domain Control Validated/OU=PositiveSSL/CN=mail.example.com issuer=/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=PositiveSSL CA 2
Make sure that you received IMAP server response:
* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA AUTH=CRAM-MD5 AUTH=PLAIN IDLE ACL ACL2=UNION] Courier-IMAP ready. Copyright 1998-2004 Double Precision, Inc. See COPYING for distribution information.
POP3 via SSL uses port 995
Connect to a mail server using openssl:
openssl s_client -showcerts -connect mail.example.com:995 -servername mail.example.com
Check output and make sure that a valid certificate is shown:
Server certificate subject=/OU=Domain Control Validated/OU=PositiveSSL/CN=mail.example.com issuer=/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=PositiveSSL CA 2
Make sure that you received POP3 server response:
+OK Hello there. <1793.1385684315@localhost.localdomain>
SMTP via SSL uses port 465
Connect to a mail server using openssl:
openssl s_client -showcerts -connect mail.example.com:465 -servername mail.example.com
Check output and make sure that a valid certificate is shown:
Server certificate subject=/OU=Domain Control Validated/OU=PositiveSSL/CN=mail.example.com issuer=/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=PositiveSSL CA 2
Make sure that you received SMTP server response:
220 mail.example.com ESMTP Postfix
SMTP via TLS/StartTLS uses port 25 or 587
Connect to a mail server using openssl:
openssl s_client -starttls smtp -showcerts -connect mail.example.com:25 -servername mail.example.com
Check output and make sure that a valid certificate is shown:
Server certificate subject=/OU=Domain Control Validated/OU=PositiveSSL/CN=mail.example.com issuer=/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=PositiveSSL CA 2
Make sure that you received SMTP server response:
250 DSN