FTPS error: Peer certificate rejected by ChainVerifier

Hi Experts,

I am having a an issue calling a FTPS server from sender FTPS chennell in SAP PI 7.11.

When the sendet FTP(s) channel polls the FTP server, it is throwing error, as seen in the audit log of channel monitoring in RWB:

Error occurred while connecting to the FTP server "xxx.yyy.com:21": iaik.security.ssl.SSLCertificateException: Peer certificate rejected by ChainVerifier

I have taken following steps to configure the connection with the FTP server:

1. I have taken two .crt file (ssl certificate for host and intermediate CA) and one .cer (ssl certificate for root CA) file from the FTP server team and imported them into trustedCA Key store view. While uploading i have uploaded the host ssl certificate first, then the intermediate ssl certificate and then the root one. I have restarted the java server after importing the ssl certificates.

2. The host name of the FTP server in the ssl certificate is same as the host name used in sender FTP(S) channel.

3. THe SAP PI and he FTP server are in the same company network.

Please suggest if there is something i have missed or there is some solution to this issue.