I tried with the certificate is opentsa page "tsa_ns.crt", still gives me the same error. This is the certificate:
Certificate: Data: Version: 3 (0x2) Serial Number: 15 (0xf) Signature Algorithm: sha1WithRSAEncryption Issuer: C=IE, ST=Co. Dublin, L=Dublin, O=OpenTSA, CN=OpenTSA Root CA/emailAddress=i...@opentsa.org Validity Not Before: Sep 23 20:20:13 2006 GMT Not After : Sep 20 20:20:13 2016 GMT Subject: C=HU, ST=Co. Bekes, L=Bekescsaba, O=OpenTSA, CN=OpenTSA demo/emailAddress=zglo...@opentsa.org Subject Public Key Info: Public Key Algorithm: rsaEncryption RSA Public Key: (1024 bit) Modulus (1024 bit): 00:d6:4c:ef:5f:21:1b:11:77:87:fe:df:14:a6:3f: 09:a3:45:ac:90:83:06:11:b1:93:3e:90:60:5e:88: 69:43:7e:d1:1f:5c:5f:60:58:f0:ea:37:b5:b0:0e: ad:6d:f6:bd:2b:15:2a:bc:b8:16:53:2f:5c:25:ee: 9d:5f:99:ad:04:a0:d2:e7:73:2f:f0:f5:87:97:de: 3f:a5:79:13:9f:0e:f8:c4:be:bf:ef:76:64:39:d2: 4b:fd:5c:3e:4d:33:a6:8c:c1:05:23:9e:33:61:8e: b2:1b:e8:d7:ae:6e:d0:b5:bf:52:bc:29:7a:c1:7e: 24:b6:de:3d:f3:5a:f7:30:ef Exponent: 65537 (0x10001) X509v3 extensions: X509v3 Basic Constraints: CA:FALSE X509v3 Key Usage: Digital Signature, Non Repudiation X509v3 Subject Key Identifier: CE:11:23:2C:41:E2:96:4C:E8:16:0D:DA:6A:FC:24:57:C2:2B:EA:78 X509v3 Authority Key Identifier: keyid:2D:9D:F7:1D:7E:65:77:9A:F4:D9:B4:99:B1:17:3B:C4:2F:C8:AD:A5 DirName:/C=IE/ST=Co. Dublin/L=Dublin/O=OpenTSA/CN=OpenTSA Root CA/emailAddress=i...@opentsa.org serial:97:36:5B:C6:93:41:1C:87 X509v3 Subject Alternative Name: email:zglo...@opentsa.org X509v3 Extended Key Usage: critical Time Stamping Signature Algorithm: sha1WithRSAEncryption da:fd:01:4c:29:ba:f0:a4:e9:21:5c:ec:6c:d4:77:6d:e7:69: 8b:9f:ec:71:43:9c:0e:9a:97:b6:4d:6a:d5:ec:24:82:52:c5: f7:07:23:64:04:07:3c:ac:f1:af:4a:67:eb:1f:57:73:23:c4: 36:2c:39:36:f0:58:bb:c8:8e:c5:af:64:02:76:bc:46:a6:c5: 62:31:7e:80:31:17:72:b5:a6:50:e8:ef:34:cd:e8:47:e6:98: 71:88:2f:07:96:f8:09:20:19:f4:8d:f4:2c:33:09:09:93:c5: f1:3a:f7:c3:2f:87:d7:01:d6:eb:ce:95:87:12:67:fa:cb:e8: 63:f6:6f:20:f2:40:a5:d8:60:49:9c:3f:79:1c:7c:34:45:c7: be:c3:63:16:0a:0d:e8:28:1a:7f:6f:75:bf:f4:e4:ec:97:93: 84:fa:8d:41:18:a7:ef:15:97:b4:8b:d7:b2:e4:5d:c1:95:47: 6d:21:3d:ea:a8:7d:31:dd:21:94:15:ea:5c:9f:1f:0e:85:bf: df:3a:45:d2:dc:1c:e4:6a:31:b7:61:f0:54:4f:a7:c1:1c:02: d9:10:f2:ed:c3:a4:90:c6:53:aa:9f:4b:84:c1:4b:06:5e:65: d3:32:b2:fe:f6:7a:96:ea:f5:07:63:48:a1:eb:54:9e:62:41: 4d:73:6b:57