Issue with Proxy:sddc-proxy.xyzbbs.net connection|| proxy error: authentication required

Dear Experts,

For one of the proxy servers I'm getting below error in SAP PI/PO.

Exception caught by adapter framework: com.jcraft.jsch.JSchException: ProxyHTTP: java.io.IOException: proxy error: authenticationrequired

There are no recent changes were done in channel configuration.

Kindly suggest what else needs to be done.

Br,

Raju