Timed out waiting for response from Mongoose: fixing the request timeout

Find and fix the timing-out layer

1. 1Determine whether it is one slow action (a report, a large filter) or everything. Everything points to server health; one action points to a query.
2. 2Time the action and note the user, form, filter values and time of day.
3. 3Check the app server: CPU, memory, application pool recycling and any IIS errors around that time.
4. 4Check SQL Server for the same period: blocking, long-running queries, missing indexes, and statistics that are out of date.
5. 5If the query is slow, narrow the filter, add an index through a supported route, or move the heavy logic to a background task.
6. 6Only then review timeout values on the client, IIS and the app server configuration and raise them modestly if the work is legitimately long.
7. 7For long operations, run them as background tasks rather than interactive requests.
8. 8Retest with the same user and filter to confirm the fix.

SQL is usually the real problem

-- Currently running requests and blockers
SELECT r.session_id, r.blocking_session_id, r.wait_type, r.total_elapsed_time, t.text
FROM sys.dm_exec_requests r
CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) t
WHERE r.session_id > 50;

Common pitfalls

• !Raising every timeout at once without finding the slow layer.
• !Ignoring blocking sessions.
• !Running large reports interactively at peak times.
• !Confusing idle session timeouts with request timeouts.
• !Not rechecking after IIS or app pool changes.