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Коллеги, уточните, пожалуйста, с чем может быть связана ошибка при вызове внешнего сервиса на DEV.

 
При отправке запроса получаю ошибку сертификата.
 
Запрос:
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Message: Send to HTTP service (http-client-starter)
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Endpoint: https://tst-merchantsbp.rshb.ru/operations/b2c/8a7b6c5d-4e3f-2a1b-9c8d-7e6f5a4b3c2d
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Request headers:
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  x-request-id: a56f71ad-3353-4331-9768-8a8ed22d48b8
  x-b3-traceid: c3bd16e2346d5c5738218c2f5bb58733
  x-b3-spanid: def3be6d3ed5aa4c
  x-b3-sampled: 1
  Accept: application/json
  X-Correlation-ID: 123e4567-e89b-12d3-a456-426614174000
  Content-Type: application/json
  x-source-system: flow-adapters
  x-source-service: espp-sync-flow
  x-interaction: SYNC
  x-service: GetB2CTransferData
  x-direction: REQUEST
  x-extension: SourceService1:espp-sync-flow;SourceSystem1:flow-adapters;SourceSystem:flow-adapters;SourceService:espp-sync-flow
  x-extension-urlencoded: SourceService1%3Aespp-sync-flow%3BSourceSystem1%3Aflow-adapters%3BSourceSystem%3Aflow-adapters%3BSourceService%3Aespp-sync-flow
 
 
Ошибка:
 
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Message: Error in thread
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Method Name: getB2CTransferDataRequest
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Exception: ru.rshbintech.integrations.cki.ip2_services.integration_libraries.http_client_starter.exceptions.types.IntegrationResponseException: WebClientRequestException while send to https://tst-merchantsbp.rshb.ru/operations/b2c/8a7b6c5d-4e3f-2a1b-9c8d-7e6f5a4b3c2d Message: (certificate_unknown) PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
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Cause:
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org.springframework.web.reactive.function.client.WebClientRequestException: (certificate_unknown) PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
javax.net.ssl.SSLHandshakeException: (certificate_unknown) PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
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Endpoint: /api/GetB2CTransferDataRequest
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Exception (full info):
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ru.rshbintech.integrations.cki.ip2_services.integration_libraries.http_client_starter.exceptions.types.IntegrationResponseException: WebClientRequestException while send to https://tst-merchantsbp.rshb.ru/operations/b2c/8a7b6c5d-4e3f-2a1b-9c8d-7e6f5a4b3c2d Message: (certificate_unknown) PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target