Hello,

a customer is trying to connect to a mailserver and fails. But looking to the logfile everything seems fine to me but it still fails. Sadly, I have no clue about why. This is the CURL log. Any ideas what's wrong here? I assume it may be the AUTH GSSAPI method, but I'm not sure.

It was using Windows 7 with LibCurl 7.43.

2018-06-26 08:15:55-1475 [4892]: VERB: CURL: Rebuilt URL to: smtp://mail.hollandsewolken.nl:587/
2018-06-26 08:15:55-1481 [4892]: VERB: CURL: Trying 185.103.18.135...
2018-06-26 08:15:55-1482 [4892]: VERB: CURL: TCP_NODELAY set
2018-06-26 08:15:55-1521 [4892]: VERB: CURL: Connected to mail.hollandsewolken.nl (185.103.18.135) port 587 (#0)
2018-06-26 08:15:55-1540 [4892]: VERB: CURL: 220 mail.hollandsewolken.nl Microsoft ESMTP MAIL Service ready at Tue, 26 Jun 2018 08:16:22 +0200
2018-06-26 08:15:55-1540 [4892]: VERB: CURL: EHLO qapc
2018-06-26 08:15:55-1567 [4892]: VERB: CURL: 250-mail.hollandsewolken.nl Hello [62.225.0.139]
2018-06-26 08:15:55-1568 [4892]: VERB: CURL: 250-SIZE 104857600
2018-06-26 08:15:55-1568 [4892]: VERB: CURL: 250-PIPELINING
2018-06-26 08:15:55-1568 [4892]: VERB: CURL: 250-DSN
2018-06-26 08:15:55-1568 [4892]: VERB: CURL: 250-ENHANCEDSTATUSCODES
2018-06-26 08:15:55-1569 [4892]: VERB: CURL: 250-STARTTLS
2018-06-26 08:15:55-1569 [4892]: VERB: CURL: 250-AUTH GSSAPI NTLM
2018-06-26 08:15:55-1569 [4892]: VERB: CURL: 250-8BITMIME
2018-06-26 08:15:55-1569 [4892]: VERB: CURL: 250-BINARYMIME
2018-06-26 08:15:55-1569 [4892]: VERB: CURL: 250 CHUNKING
2018-06-26 08:15:55-1570 [4892]: VERB: CURL: STARTTLS
2018-06-26 08:15:55-1597 [4892]: VERB: CURL: 220 2.0.0 SMTP server ready
2018-06-26 08:15:55-1598 [4892]: VERB: CURL: schannel: SSL/TLS connection with mail.hollandsewolken.nl port 587 (step 1/3)
2018-06-26 08:15:55-1598 [4892]: VERB: CURL: schannel: disabled server certificate revocation checks
2018-06-26 08:15:55-1599 [4892]: VERB: CURL: schannel: sending initial handshake data: sending 187 bytes...
2018-06-26 08:15:55-1600 [4892]: VERB: CURL: schannel: sent initial handshake data: sent 187 bytes
2018-06-26 08:15:55-1601 [4892]: VERB: CURL: schannel: SSL/TLS connection with mail.hollandsewolken.nl port 587 (step 2/3)
2018-06-26 08:15:55-1601 [4892]: VERB: CURL: schannel: failed to receive handshake, need more data
2018-06-26 08:15:56-1667 [4892]: VERB: CURL: schannel: SSL/TLS connection with mail.hollandsewolken.nl port 587 (step 2/3)
2018-06-26 08:15:56-1668 [4892]: VERB: CURL: schannel: encrypted data buffer: offset 3207 length 4096
2018-06-26 08:15:56-1707 [4892]: VERB: CURL: schannel: sending next handshake data: sending 214 bytes...
2018-06-26 08:15:56-1743 [4892]: VERB: CURL: schannel: SSL/TLS connection with mail.hollandsewolken.nl port 587 (step 2/3)
2018-06-26 08:15:56-1743 [4892]: VERB: CURL: schannel: encrypted data buffer: offset 107 length 4096
2018-06-26 08:15:56-1743 [4892]: VERB: CURL: schannel: SSL/TLS handshake complete
2018-06-26 08:15:56-1743 [4892]: VERB: CURL: schannel: SSL/TLS connection with mail.hollandsewolken.nl port 587 (step 3/3)
2018-06-26 08:15:56-1744 [4892]: VERB: CURL: schannel: stored credential handle in session cache
2018-06-26 08:15:56-1744 [4892]: VERB: CURL: EHLO qapc
2018-06-26 08:15:56-1771 [4892]: VERB: CURL: schannel: client wants to read 16384 bytes
2018-06-26 08:15:56-1771 [4892]: VERB: CURL: schannel: encdata_buffer resized 17408
2018-06-26 08:15:56-1771 [4892]: VERB: CURL: schannel: encrypted data buffer: offset 0 length 17408
2018-06-26 08:15:56-1772 [4892]: VERB: CURL: schannel: encrypted data got 277
2018-06-26 08:15:56-1772 [4892]: VERB: CURL: schannel: encrypted data buffer: offset 277 length 17408
2018-06-26 08:15:56-1772 [4892]: VERB: CURL: schannel: decrypted data length: 192
2018-06-26 08:15:56-1772 [4892]: VERB: CURL: schannel: decrypted data added: 192
2018-06-26 08:15:56-1772 [4892]: VERB: CURL: schannel: decrypted data cached: offset 192 length 16384
2018-06-26 08:15:56-1772 [4892]: VERB: CURL: schannel: encrypted data buffer: offset 0 length 17408
2018-06-26 08:15:56-1772 [4892]: VERB: CURL: schannel: decrypted data buffer: offset 192 length 16384
2018-06-26 08:15:56-1773 [4892]: VERB: CURL: schannel: schannel_recv cleanup
2018-06-26 08:15:56-1773 [4892]: VERB: CURL: schannel: decrypted data returned 192
2018-06-26 08:15:56-1773 [4892]: VERB: CURL: schannel: decrypted data buffer: offset 0 length 16384
2018-06-26 08:15:56-1773 [4892]: VERB: CURL: 250-mail.hollandsewolken.nl Hello [62.225.0.139]
2018-06-26 08:15:56-1773 [4892]: VERB: CURL: 250-SIZE 104857600
2018-06-26 08:15:56-1773 [4892]: VERB: CURL: 250-PIPELINING
2018-06-26 08:15:56-1773 [4892]: VERB: CURL: 250-DSN
2018-06-26 08:15:56-1773 [4892]: VERB: CURL: 250-ENHANCEDSTATUSCODES
2018-06-26 08:15:56-1774 [4892]: VERB: CURL: 250-AUTH GSSAPI NTLM LOGIN
2018-06-26 08:15:56-1774 [4892]: VERB: CURL: 250-8BITMIME
2018-06-26 08:15:56-1774 [4892]: VERB: CURL: 250-BINARYMIME
2018-06-26 08:15:56-1774 [4892]: VERB: CURL: 250 CHUNKING
2018-06-26 08:15:56-1774 [4892]: VERB: CURL: AUTH GSSAPI
2018-06-26 08:15:56-1802 [4892]: VERB: CURL: schannel: client wants to read 16384 bytes
2018-06-26 08:15:56-1802 [4892]: VERB: CURL: schannel: encrypted data buffer: offset 0 length 17408
2018-06-26 08:15:56-1802 [4892]: VERB: CURL: schannel: encrypted data got 101
2018-06-26 08:15:56-1802 [4892]: VERB: CURL: schannel: encrypted data buffer: offset 101 length 17408
2018-06-26 08:15:56-1802 [4892]: VERB: CURL: schannel: decrypted data length: 22
2018-06-26 08:15:56-1802 [4892]: VERB: CURL: schannel: decrypted data added: 22
2018-06-26 08:15:56-1803 [4892]: VERB: CURL: schannel: decrypted data cached: offset 22 length 16384
2018-06-26 08:15:56-1803 [4892]: VERB: CURL: schannel: encrypted data buffer: offset 0 length 17408
2018-06-26 08:15:56-1803 [4892]: VERB: CURL: schannel: decrypted data buffer: offset 22 length 16384
2018-06-26 08:15:56-1803 [4892]: VERB: CURL: schannel: schannel_recv cleanup
2018-06-26 08:15:56-1803 [4892]: VERB: CURL: schannel: decrypted data returned 22
2018-06-26 08:15:56-1803 [4892]: VERB: CURL: schannel: decrypted data buffer: offset 0 length 16384
2018-06-26 08:15:56-1803 [4892]: VERB: CURL: 334 GSSAPI supported
2018-06-26 08:15:56-1971 [4892]: VERB: CURL: Closing connection 0
2018-06-26 08:15:56-1972 [4892]: VERB: CURL: schannel: shutting down SSL/TLS connection with mail.hollandsewolken.nl port 587
2018-06-26 08:15:56-1975 [4892]: VERB: CURL: schannel: clear security context handle
2018-06-26 08:15:56-1976 [4892]: CRIT: CURL_SendMail(curl_include.pbi:2538): Error performing Login. Curl ec:56

Thank You!!!
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Received on 2018-06-26