Solution never deployed at one of a SharePoint server

Issue:
One of a SharePoint server in a farm creating problem and it stops to deploy solutions, but when we clicked on the solutions name it shows that the solution deployed all the servers except the corrupt server.
Resolution:
1) Enabled the verbose log --> Found that the error is related to timer service which stopped intermittently.
2) When we clicked on "Check Job status" in central admin we found the similar error message "Object reference not set to an instance of an object." and it is also pointing for timer service error in ULS log.
3) We checked the status of server and it was "Need Upgrade" in servers in farm(through central admin). We removed the corrupt from stage external farm.
4) Ran the stsadm command "PSConfig.exe -cmd upgrade -inplace b2b -force -cmd applicationcontent -install -cmd installfeatures" at corrupt server and found few error that the web.config file of central admin is not available in virtual folder.
5) Copied the required folder/files from other stage server to corrupt server and again ran stsadm command "PSConfig.exe -cmd upgrade -inplace b2b -force -cmd applicationcontent -install -cmd installfeatures. This time it completed and it upgraded the timer service.
6) Now the error at servers in farm has been wiped out.
7) We attached the server corrupt server back to stage farm.