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NationalAssociationOfRealtors / libRETS

libRETS is RETS client library written in C++ that allows rapid development of RETS client applications. By saving the developer from dealing with the RETS protocol details, the application writer can concentrate on their application, saving them time and money in the process
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abundance of 404 Connection Errors when attmepting to connect to rets server... #60

Closed robdob closed 6 years ago

robdob commented 6 years ago

when using librets.dotnet V4.0.30319 ( from Nuget Package 1.6.2 ) I seem to be encountering a lot of 404 connection errors. I have spoken to the rets server people and they tell me that they have no record of any connection problems. They seem to think its all on my end.. Prior I don't think that I was ever getting any errors on connection. I'm not sure if it related to the latest librets or not..
this error I'm getting is:

Could not get URL [ http://rets.torontomls.net:6103/rets-treb3pv/server/action] - HTTP response code: 401

Any help would be greatly appreciated.. thanks in advance..

robdob commented 6 years ago

I've gone back to using V1.5.2 and everything seems much better so the last two releases of librets don't seem to be that stable for me.. Do you have plans to address this and release a stable version or am I best to stay with this oldest version?

thanks,

zBestData commented 6 years ago

I believe we are experiencing the same or similar problem. On March 28, 2017 we lost the ability to connect with NavicaMLS and have been receiving this error.

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Could not get URL [ https://rets2.navicamls.net/login.aspx] - HTTP response code: 503 Service Unavailable

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We are able to connect via other methods, phpRETS and RetsConnector, but not via the libRets.dll. So far, we have only seen the issue with Navica. None of the other RETS providers. We have also not been able to resolve the problem and rolling back the version has had no effect.

RobOverman commented 6 years ago

I am connecting to a Matrix (CoreLogic) RETS server with v4.0.30319 without any issue. Could it be a default RETS version issue? That is, setting session.SetRetsVersion(librets.RetsVersion) to a lower version. I don't have access to Navica or Stratus servers so this is just a guess.

zBestData commented 6 years ago

Already tried rolling back the version. Event made a bare bones test app that was tried on 4 different machines using 3 different networks. No luck. Can connect to Matrix, Flex, reDataVault, and a couple MLS's with their own independent server. Just not Navica.

rpratt7opals commented 6 years ago

In my case 503 Service Unavailable error turned out to be a TLS 1.2 issue. I just had a server move from http to https (Matrix). And when it did, I went 503. It doesn't look like librets supports TLS 1.2 (see Issue #21), at least for Windows. I solved my problem for now by using the MODE_NO_SSL_VERIFY flag on the RETSSession to disable verification of the certificate. session.SetModeFlags(RETSSession.MODE_NO_SSL_VERIFY); See //groups.google.com/forum/#!msg/librets/MHmQvcqudLI/wRTYjQlIAwAJ If anyone knows of a TLS 1.2 solution for librets, please let me know.

zBestData commented 6 years ago

Yes! Thank you for following up!

The solution that finally worked for us was setting the “RETS Mode” to MODE_NO_SSL_VERIFY. Apparently, there has been an update somewhere that has not gotten to everyone. Navica seemed pretty oblivious and wasn’t much help in identifying possible causes or changes in the system. I was pretty much on own in trying to figure out a solution to the problem. Our platform is also proprietary and built on the libRETS.dll provided by RESO. Feel free to reach out to me directly if you want to compare notes. I am in North Carolina on Eastern Standard Time and am usually free most days between 10am and 2pm.

All the Best!

Graham Davis zBest Data Technologies, LLC Durham, NC (919) 251-5050 zBestData.comhttp://zbestdata.com/ Microsoft Partner

[Untitled-1] Make it simple ∙ Make it easy ∙ Make it flow!

From: Faith Steltzer notifications@github.com Sent: Tuesday, August 7, 2018 5:45 PM To: NationalAssociationOfRealtors/libRETS libRETS@noreply.github.com Cc: Graham usskipper@outlook.com; Mention mention@noreply.github.com Subject: Re: [NationalAssociationOfRealtors/libRETS] abundance of 404 Connection Errors when attmepting to connect to rets server... (#60)

@zBestDatahttps://github.com/zBestData I realize it's been a long time, but did you ever get resolution on connecting to Navica? I am having this exact problem right now with my company's proprietary RETS software and I've come to libRETS hoping to troubleshoot/compare to our software and get the same 503 error on login. Any help you can offer is greatly appreciated!

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jbramleycl commented 5 years ago

The latest changes to the windows build allow for it to compile against a newer version of openssl and thus support TLS1.2.