SAPB1 Service Layer Error while connecting to database server

[#1]

Dear SAP SDN Team,

Last week ReInstalled SLD - and all SAP Servvices - Services Layer Properly worked - with b1s/v1 login

Today Getting this error - other side on 1 user can access it through Postman 
on local server getting this error after username b1i and password entering
{ "error" : { "code" : 100000027, "message" : { "lang" : "en-us", "value" : "Error while connecting to database server 10.30.1.9\\INST_10\n" } } }

SAP B1 is Properly working - there is no issue with Database server connectivity.

[ANKIT_CHAUHAN]

Hi @PARAGMewada ,

In order to rule out any underlying issue, could you try to reinstall Service Layer once and share the results with us?

Kind regards,

ANKIT CHAUHAN

SAP Support

[PARAGMewada]

Dear Ankit,

[PARAGMewada]

Dear Ankit, Thank you for Replay, and Inform You that last week we did same practice reinstall everything include service layer, but it works till yesterday accidentally what happen dont know, it shows error message