You are using the Web Security.cloud Client Site Proxy and the Schemus LDAP Synchronization Tool and are experiencing issues with the Schemus sync.
Schemus should not be run through the Client Site Proxy (CSP) as the CSP relies on NTLM Authentication for anything connecting to it sending information. Schemus does not support NTLM Authentication therefore cannot process the Schemus upload. Please do not select the location of your CSP machine as a proxy within the Schemus Wizard set up as uploads will fail.
If you must have port 3128 only for all traffic and therefore have to send the Schemus upload through the CSP the ONLY work around for this is to remove the NTLM Authentication for Schemus within the Schemus Squid configuration file, which looks like this:
#Bypass for streaming.'customer'.com
acl schemus dstdomain api.messagelabs.com