Lessons learned from support cases - common things to look for.

Does DNS functioning properly?

...

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.)