48 CHAPTER 2: INSTALLING THE W EBCACHE You cannot enter a host name starting or ending with a . (dot)character. It must start and end with a letter or number. You cannot enter a host name containing a space character. Domain Name The domain name must be at least 1 character long. The domain name must not exceed 63 characters long. The domain name must be comprised of alphanumeric characters,- (hyphens) and _ (underscores). You cannot enter a domain name starting or ending with a . (dot)character. It must start and end with a letter or number. Each part of the domain name (known as a label) must beseparated with a . (single dot). You cannot enter a domain name which has two . (dots) next to eachother.
