New Install - Authentication issues

Brand new install on a windows server and when trying to send an SMTP email via powershell I am unable to connect and send an email.

It is failing the authentication step
I created a local account and used that account name and password but it wont authenticate with those credentials.

I can login to the webmail interface with the same account though?

Log extract:
5 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 220 SERVERNAME Axigen ESMTP ready
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: << EHLO NZ10860
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: Set remote delivery to auth
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: Greylist disabled
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: Set max data size to 10240 KB
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: Set max received headers to 30
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: Maximum recipient count set to 1000
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: Wait for processing response at least 10 seconds
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: STARTTLS extension allowed
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: 8BIT MIME accepted
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: BINARY DATA extension allowed
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: PIPELINING extension allowed
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: DSN extension denied
2024-02-15 15:28:18 +1300 08 SERVERNAME SMTP-IN:0000006E: Set local delivery to all
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 250-SERVERNAME Axigen ESMTP hello
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 250-PIPELINING
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 250-AUTH PLAIN LOGIN CRAM-MD5 DIGEST-MD5 GSSAPI
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 250-AUTH=PLAIN LOGIN CRAM-MD5 DIGEST-MD5 GSSAPI
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 250-8BITMIME
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 250-BINARYMIME
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 250-CHUNKING
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 250-SIZE 10485760
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 250-STARTTLS
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 250-HELP
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 250 OK
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: << AUTH gssapi ********
2024-02-15 15:28:18 +1300 02 SERVERNAME SMTP-IN:0000006E: sasl_server_start error: ‘SASL(-1): generic failure: GSSAPI Error: No credentials were supplied, or the credentials were unavailable or inaccessible (Key table file ‘C:\Windows\krb5kt’ not found)’
2024-02-15 15:28:18 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 535 Authentication failed
2024-02-15 15:28:18 +1300 02 SERVERNAME SMTP-IN:0000006E: Authentication error: Generic error
2024-02-15 15:28:19 +1300 16 SERVERNAME SMTP-IN:0000006E: >> 421 SERVERNAME error reading data
2024-02-15 15:28:19 +1300 08 SERVERNAME SMTP-IN:0000006E: closing session from [x.x.x.x]

Please ignore, turned out to be a firewall IPS block that was killing the connection during authentication.