Sometimes when you try to access web services (or download internet content in general), PowerShell may bail out and complain about not being able to set up a protected SSL channel.
Let’s take a look at such an issue. Below is a code that is calling a web service connected to the German railway system. It is supposed to list the train stations in a given city:
$city = "Hannover" $url = "https://rit.bahn.de/webservices/rvabuchung?WSDL" $object = New-WebServiceProxy -Uri $url -Class db -Namespace test $request = [test.SucheBahnhoefeAnfrage]::new() $request.bahnhofsname = $city $response = $object.sucheBahnhoefe($request) $response.bahnhoefe
Instead, it throws a number of exceptions related to SSL connection problems. Typically, these errors stem from two issues:
- The SSL certificate used by the web site to establish the SSL connection is invalid, expired, or not trustworthy
- The SSL connection requires a protocol currently not enabled
To solve problems associated with these issues, simply run these lines:
# ignore invalid SSL certificates [System.Net.ServicePointManager]::ServerCertificateValidationCallback = {$true} # allowing SSL protocols $AllProtocols = [Net.SecurityProtocolType]'Ssl3,Tls,Tls11,Tls12' [Net.ServicePointManager]::SecurityProtocol = $AllProtocols
Once you do, for the current PowerShell session all is good. The above code now returns the train stations in the Hannover area, and if you dig deeper into the rich object model, you could even order your train tickets using PowerShell.
name nummer ---- ------ Hannover Hbf 8000152 Hannover-Linden/Fi. 8002586 Hannover-Nordstadt 8002576 Hannover Bismarckstr 8002580 Hannover-Ledeburg 8002583 Hannover-Vinnhorst 8006089 Hannover-Leinhausen 8002585 Hannover Wiech-Allee 8002591 Hannover Ander.Misb. 8000578 Hannover Flughafen 8002589 Hannover-Kleefeld 8002584 Hannover-Bornum 8002581 Hann Münden 8006707 HannoverMesseLaatzen 8003487
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