These were the design limitations set forth by the manufacturer and ok’ed by Dell. Both limitations and/or requirements, depending on how you want to look at the concerns, are documented within the User’s Guide:
For SNMP Community Names:
f. Community Name - An SNMP community name is a text string that acts as
a password to authenticate messages sent between the SNMP remote
management application and the library. Enter your preferred name, or leave
as “public”. The Community Name is limited to 33 alpha-numeric characters
(A-Z, a-z, 0-9).
For the password:
4. Enter the New Password . The password has a maximum of 10 characters (A-Z,
a-z, 0-9, @, <hyphen>, <space>, <period>).
In regards to you not getting an error msg when a password is not accepted, I will send a message to our engineering team and let them know that a design enhancement is recommended by an end-user for their consideration.