hi,<BR>when i run my asp page on single user environment, it works fine ... but in production, with 3-tier architecture & concurrent users trying accessing the site, it gives error<BR><BR>OnStartPage: Access violation at address 77F6496B in module &#039;ntdll.dll&#039;. <BR>Write of address 1F36DC50 error &#039;8000fff&#039;<BR><BR>Catastrophic failure<BR><BR>OnStartPage is the method called in COM- delphi.<BR><BR>can anybody help me with the error?<BR><BR>thanks in Advance.<BR>NAN.<BR>