Sorry,we can't open this document because there was a problem talking to the service - Office Web Apps 2013
Farm Information:
- Web Application published internally and externally (so make sure both URLs added to Alternate Access Mapping)
- Office Web Apps 2013 (Published externally via TMG 2010 and internally)
I have a farm which connected to Office Web Apps 2013 and It's working fine internally so then we decided to enable it to open Office Web Apps externally by the following steps :
1- In Office Web Apps Server , Open Power Shell and run this command to add the External URL to existing Farm:
Set-OfficeWebAppsFarm -ExternalURL https://test.com/
2-In SharePoint Server , Open SharePoint 2013 Management Shell and run the following commands:
Remove-SPWOPIBinding –All:$true
New-SPWOPIBinding -ServerName OfficeWebAppServer.com -AllowHTTP
Set-SPWopiZone internal-http
$c = Get-SPSecurityTokenServiceConfig
$c.AllowOAuthOverHttp = $true
$c.Update()
then when I tried to access the Office documents from External URL I got the following error :
"Sorry,we can't open this document because there was a problem talking to the service"
This issue related to TMG publishing rule so to fix it :
1- Open TMG Management Console
2- Go to Publish rule for Office Web Apps
3- Right click on the rule and choose Configure HTTP
4- Uncheck Verify Normalization
5- Click ok
6- Click Apply
7- Wait the sync process
Ref: