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DPS server not responding - Request aborted. Could not create secure SSL/TLS channel

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Dear Devolutions,


yesterday i have upgrade the test datasource to the latest DPS version and RDM version:
DPS 2019.1.17.0 and RDM 2019.1.35.0.
However, when i connect to the test datasource, i get the error message: DPS server not responding - Request aborted. Could not create secure SSL/TLS channel.
i didn't had this error with DPS 2019.1.9 and RDM 2019.1.25.0.
What has been changed in the meantime, and how can i solve this error? smile
Thanks in advance.


Clock3 mths


Hello,

Are you using a certificate with your DPS test instance? Is it possible that this certificate may be expired?

Best regards,



Érica Poirier

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Clock3 mths

Hi Erica,
We use indeed a certificate, but it is still valid. The production environment uses the same certificate and there i don't get this message.
I also noticed some errors in the DPS log of the test datasource and when i log into the DPS webinterface.
I see several errors regarding Null values:
InvalidOperationException - Nullable object must have a value.
Maybe something did go wrong?
Kind regards,
Valid Operations

Clock3 mths


Hello,

Thank you for the information.

Could you please have a look on this post? This could hlp to resolve the InvalidOperationException issue.
https://forum.devolutions.net/topic32154-upgrade--to--problem.aspx#post130373

About the Requet aborted error, could you please in the Windows Event Logs if there is any relevant error messages that could help us to troubleshoot this issue?

By the way, I will move this thread in the Devolutions Password Server support forum section.


Best regards,



Érica Poirier

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Clock3 mths

Hi Erica,
Thanks for the quick reply. I have applied the fix mentioned in the link, and as far as i can see the Errors are gone.
I also took a look in the windows event viewer, but couldn't find any events related to the SSL/TLS error in RDM.
What i find curious is that with RDM client 2019.1.25.0 i can connect to both the test and production datasource without any error.
There must some difference between RDM2019.1.25.0 and 2019.1.35.0 in how certificates or encryption is being handled?


Clock3 mths

Hello,

Indeed some improvements have been made on certificate handling in RDM.

Could you please try to check which options are enabled in File - Options - Security - Certificate security? You could try to enable the Ignore application certificate errors and disable the Check for server certificate revocation options.

If it's still not working, could you please try the latest RDM version 2019.1.38?

image

Best regards,



Érica Poirier

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Clock3 mths

Hi Erica,
Thanks for the reply. I have tested with the above settings, but to no avail. I also tested with RDM v2019.1.38.0. I keep getting the same error message.
However, i might have an idea why.
We have 2 DPS servers deployed in an Active/Active config, with a netscaler in front of it, for loadbalancing. RDM connects to an dns name, which resolves to a virtual ip address on the netscaler, which then forwards the request to one of the DPS servers. The loadbalancer also presents the certificate to the client, which is valid.
However, i see that the loadbalancer only can speak TLS v1. SSLv2/v3 and TLS v1.1 and 1.2 are disabled.
Can it be that RDM only can speak TLS v1.1 and above which is changed in the last couple of versions? TLS v1.0 is flagged as insecure.

Clock2 mths


Hello,

You will find more information about TLS Managegement with RDM and DPS in the following article.
https://devolutions.atlassian.net/servicedesk/customer/portal/1/topic/2d8093b1-0e18-4dfb-be4b-786523485f0b/article/529662158

Best regards,



Érica Poirier

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Clock2 mths

Hi Erica,
I have done some further investigation, but i can't find out whats happening.
Is it possible to arrange a support session to gain further insights in this issue?
thanks in advance.

Clock2 mths


Hello,

Sure we can arrange a support session. Please send an email to ticket@devolutions.net and we will send you the online calendar link.

Best regards,



Érica Poirier

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Clock2 mths


Hi Erica,

I am experiencing the same (or a similar) problem. If I start RDM I get the error message 'Unable to connect to your data source', 'DPS server is not responding' (details below).

Strange thing is that from a different PC I can login with the same user without problems.


I have no clue why it is a 'TryGoOfflineException' as I'm not trying to go offline, I'm just trying to open RDM.

Any ideas?


Devolutions.RemoteDesktopManager.Business.TryGoOfflineException: DPS server is not responding.The remote server returned an error: (404) Not Found. at Devolutions.RemoteDesktopManager.Business.DataSources.RDMSConnectionDataSource.cb6f90699089bd1c9688221883b0c338f(String c18973cea236a9feff75c32ca7d1697d5, String ceb81d1ee93f91e0bc57f34876c263863, Boolean c8c947c51eb176e7175409fd081e947ab, Boolean c2de1417c23cd0676ca16f3b418d16455) at Devolutions.RemoteDesktopManager.Business.DataSources.RDMSConnectionDataSource.c88b8bc6e236931f324b713404e90b15d(Boolean c5d807049ab3ae30aad5318fa57dc6159, String& c18973cea236a9feff75c32ca7d1697d5, String& ceb81d1ee93f91e0bc57f34876c263863, Boolean c610d13086e89db4f49ea9522070c88ec, Boolean c575c634ac2e9c9220d3bb5cb37d2a34f) at Devolutions.RemoteDesktopManager.Business.DataSources.RDMSConnectionDataSource.Login(Boolean useCredentials) at Devolutions.RemoteDesktopManager.Business.DataSources.RDMSWebApiClient.get_c3e2a9eaefc85e07772d691a26117253e() at Devolutions.RemoteDesktopManager.Business.DataSources.RDMSWebApiClient.ca57904db71c82dc73869f78817c39be7.cdf58e16eb8b138876bc94432fe455e46() at Devolutions.RemoteDesktopManager.Business.DataSources.RDMSWebApiClient.c5f4f6c72c053c0cd60a62abeeaa43fdf[cb75a0a5d15a1ad8b8a8a5e57cca214a3](c31561c0d54939abd223ac7c0cf30e7e6`1 c6cc9ab02b2ea9ccd42c7c0497677bcc2, ExecuteActionLogMode c92f46156e371279a4f61cd5822be5fee) at Devolutions.RemoteDesktopManager.Business.DataSources.RDMSWebApiClient.GetData(String proxyConnectionCacheID, Byte[] version, String repositoryID) at Devolutions.RemoteDesktopManager.Business.DataSources.RDMSConnectionDataSource.GetDataSourceSettings(String repositoryID) at Devolutions.RemoteDesktopManager.Business.DataSources.RDMSConnectionDataSource.GetDataSourceSettings() at Devolutions.RemoteDesktopManager.Managers.ConnectionManager.c29fbd34504079a3525ca4c390d5d4074(BaseConnectionDataSource c7f28727fc7a5daa94ba08f688b2a5781) at Devolutions.RemoteDesktopManager.Managers.ConnectionManager.ca4799bebd8b706f34eea94a778843b55(BaseConnectionDataSource c7f28727fc7a5daa94ba08f688b2a5781, Boolean cfe205b02d73750f8fd14d199343fe545) at Devolutions.RemoteDesktopManager.Managers.ConnectionManager.LoadConnections(BaseConnectionDataSource dataSource, ConnectionEngine currentEngine)

Clock2 mths


Hello,

Unfortunately, RDM will only mention that it cannot connect on the DPS instance without giving us any details about the exact problem.

Do you have any error messages in the DPS logs? If so, can you post the detailed error message here?
Here is the online help page on how to View DPS Logs.

Best regards,



Érica Poirier

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Clock2 mths


Hi Erica,

I found the issue. DPS was running in a /dvls virtual directory that was omitted in the datasource URL. The 404 in the exception was the clue.

Thanks!

Clock2 mths

Hello,

Thanks for your feedback!

Have a nice one


Best regards,



Alex Belisle

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Clock2 mths