c# - Send a file via HTTP POST UploadFile Error: Could not establish trust relationship for the SSL/TLS secure channel -


i trying post xml file url given me:

https://54.xx.xx.xxx/mycompany/path

using (webclient client = new webclient()) {   client.uploadfile(url, filepath); }

however, error:

"the underlying connection closed: not establish trust relationship ssl/tls secure channel."

when open url, returns page saying "running" however, see lock x on it, error: "the identity of website has not been verified".

could problem? need light please.

it seems site uses ssl certificate authenticity , reason, application verifies authenticity , not allow operation run due "lack of security"

possibly certificate expired?


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