Lessons learned from support cases - common things to look for.
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Does DNS functioning properly?
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Compare the system UTC time with actual UTC time. A site such as https://time.is/UTC will show current UTC time.
If the system time is not correct it will result in a lot of problems.
- Time stamps not correct on events
- Graph data not correct
- Transactions with other systems fail (e.g. cookies could already be expired at the time of issue.)