Macro not working for fetching data from Active Directory

[p45cal]

Also When I checked macro line by line items by pressing F8 key its is showing blank in "idapstr" line where as in old machine when using same macro its working fine.

If ldapstr is blank (note it starts with a lower case L not an upper case i) it means that line isn't executed at all; it would show at least something even if other variables are blank.
Therefore the line If signum <> "" And updateFlag = 1 Then is returning FALSE so I'd point you to looking at whether signum isn't "" and updateFlag is 1.

Also, before stepping through the code, remove or comment-out the line On Error Resume Next as it is hiding errors that you want to know about while debugging.