api {

web_server:  http://10.3.19.183:8080 
api_server:  http://10.3.19.183:8008 
files_server:  http://10.3.19.183:8081 
verify_certificate = False
credentials {
    "access_key" = "M3Q7QA2TT48OHV6MMFVW"
    "secret_key" = "r7s6axxIpKsNT9sQrxSfsTdZOZti2TS9eJVN9mTVYUqRa15HZT"
}

}

Detected credentials key="WRDIF3K1AQQTAADGU8HD" secret="p8qS***"
WEB Host configured to: [ http://10.3.19.183:8080 ]
API Host configured to: [ http://10.3.19.183:8008 ]
File Store Host configured to: [ http://10.3.19.183:8081 ]

ClearML Hosts configuration:
Web App: http://10.3.19.183:8080
API: http://10.3.19.183:8008
File Store: http://10.3.19.183:8081

Verifying credentials ...
Error: could not verify credentials: key=WRDIF3K1AQQTAADGU8HD secret=p8qSszJ0v8VmDChBowpGztfwQIILaRYvbuqfkcBFBLTwRrii8M, exception=Failed getting token (error 403 from http://10.3.19.183:8008 ): Forbidden

Yes, I tried it. Getting Json response from both urls. 8080 portal is accessible and I could generate credentials as well which I pasted for clearml-init but doesn't work there

Did you try curl http://<server-address>:8080 and curl http://<server-address>:8008 from the development machine?

Can you curl http://10.3.19.183:8008 from your workstation?

How exactly did you configure your clearml.xonf file? Can you share the api section?