RE: Sametime 6.5.1 on Solaris - Meeting cannot be launched? Sametime Support 10.Aug.05 10:45 AM a Web browser Online Meeting Center/Meeting Room 6.5.1Solaris
I would first suggest testing a meeting with anonymous access allowed and do not login as an authenticated user.
If this works then start with technote 1100862.
However this could be an SSO token issue and you could disable this in the Domino server and retest using Sametime Tokens, or a Home server not specified / resolvable issue
Is the external LDAP server Domino or 3rd party?
If Domino LDAP see technote 1113326 on specifying the homeserver value. Be sure to evaluate both working windows and solaris servers to see that the stconfig.nsf and da.nsf docs are setup the same. and if any custom .class files are being used they are also the same configuration.
Follow technote 1086819 to enable debugging on the MRC and capture the javaconsole for the issue. Look at any connection / disconection messages toward the bottom and search on the error given on our Knowledge base.