I got this answer in following link-
http://www-10.lotus.com/ldd/nd6forum.nsf/0/c988a7cd7f079bae852572050055085c?OpenDocument
Answer-
I had a similar issue with user accessing his mail database on a server. there was no problem accessing a replica on another server. And I had no problem accessing it from other computers. I guessed it had to be something on his local laptop. I tried all kinds of things compact, fixup, updall, deleted cache.ndk and bookmark.nsf. Nothing worked. I remembered setting him up with local replica of his mail db about a year ago. I checked it out. Sure enough it was still R5 (everything we use is 6.5.5 now). Deleted the local replica and voila - everything worked great. Follow this also- http://www-10.lotus.com/ldd/nd6forum.nsf/0/1d9b39ab53af383b85256f0e002f153c?OpenDocument Hope this will help you.