STMS issue

Hai ,

i am using ECC 6 with MS sql 2005.

now suddenly transport is throw an error.

the sharing / SAP lock administrator rights are given properly.

i gave the DEV server as domain controller and added PROD server to it.

Now the PROD server is missing ... on seeing the STMS in DEV.

Only DEV is there. In System overview it show DEV only , PROD is missing

But in Transport route it show the PROD as RED color.

then i login in PROD ... it show all system .

now the transport is not done.

how to solve this issue ?