Is your wireless printer offline? Here’s how you can get it back online in a few simple ways. First of all, you should try to reconnect your printer to the wifi and then see if it is back online or not.
If not, then hold the printer’s wifi switch till the lights start flickering. Once if constantly blinks blue, press the router’s WPS button. If this doesn’t help then you can restart the spooler services.
You should also make sure that the canon printer has been set as default otherwise it might continue to show offline status even though it will be on and perfectly connected.
https://www.canonprintersupportpro.us/blog/fix-canon-printer-offline-issue/
QuickBooks company file is one of the most secured files that contains crucial information about your QB application. Only an administrator or someone with administrator rights can open this file on the server computer. This can not be accessed by any other user. If you want to access the company file but QuickBooks won't open the company file this clearly means you are not allowed to open it. You can do one of the following things to open the file-
1.	Run QuickBooks as Administrator. 
2.	Verify the network date and time settings.
3.	Check do you have permission to access the QB installation folder? 
4.	Check the internet explorer settings.
5.	Check your firewall and antivirus settings.
  https://www.quickbookssupportphonenumber247.co/blog/quickbooks-wont-open/
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