'Regular Blast', 'PSI/PHI Blast', 'MegaBlast', and 'Blast 2 Sequences' all have client/server versions (with '_cs' string in their names) for Entrez gi/accession lookups and printing Taxonomy reports. Configuration of client/server interface from the user site to NCBI should be done in the same way as for any other client/server program to NCBI, such as Sequin, Cn3D, and blastcl3.
If the program 'blastcl3' works without problems, the client-server version of the wwwblast programs should work as well. For wwwblast setups behind firewalls, the default configuration will not work. Users with problems connecting to NCBI should refer to this web document for additional information: http://www.ncbi.nlm.nih.gov/IEB/ToolBox/NETWORK/firewall.html.
Document on blastcl3 has additional information on setup for that program behind firewalls: ftp://ftp.ncbi.nlm.nih.gov/blast/documents/netblast.html.