[ww-devel] The library browser not updating problem

Arnold Pizer apizer at math.rochester.edu
Thu Aug 28 17:19:23 EDT 2014 

Hi,

Just tried Geoff's fix and it works BUT with the same weird behavior as
above, i.e. $server_root_url   = 'https://192.168.56.101'; fails but
$server_root_url
  = 'http://192.168.56.101 <https://192.168.56.101/>'; works.

Arnie


On Thu, Aug 28, 2014 at 3:35 PM, Arnold Pizer <apizer at math.rochester.edu>
wrote:

> No, I didn't see Geoff's pull request.  But here is something that is for
> me VERY weird.
>
> If in site.conf I set
> $server_root_url   = 'http://localhost';
> or
> #$server_root_url   = 'http://192.168.56.101';
> everything works.
>
> Note that I have http://192.168.56.101/webwork2/ redirected to
> https://192.168.56.101/webwork2/ but things were working without this.
>
> Now here is the weird part.  If in site.conf I set
> $server_root_url   = 'https://localhost';
> or
> #$server_root_url   = 'https://192.168.56.101';
>
> I get the same error in the library browser I was getting before.  Anybody
> have a clue as to what is going on?
>
> Arnie
>
>
> On Thu, Aug 28, 2014 at 2:50 PM, Jason Aubrey <aubreyja at gmail.com> wrote:
>
>> Also in case you didn't see it Geoff submitted a pull request with a
>> modification to WebworkClient.pm that he says fixes it;
>>
>> https://github.com/openwebwork/webwork2/pull/474
>> <https://urldefense.proofpoint.com/v1/url?u=https://github.com/openwebwork/webwork2/pull/474&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=RoJw%2FW1FRudTnLiaRwnUtv3RFD0IwB0qdHV7Fhpzf14%3D%0A&s=1908770f9c191d3c7cb33de2a97b6faeb73b4258ebc689bee4b39b4af988f67d>
>>
>> Jason
>>
>>
>> On Thu, Aug 28, 2014 at 11:45 AM, Arnold Pizer <apizer at math.rochester.edu
>> > wrote:
>>
>>> Hi all,
>>>
>>> I got this working by creating my own Certification Authority following
>>> the directions at
>>> https://help.ubuntu.com/14.04/serverguide/certificates-and-security.html
>>> <https://urldefense.proofpoint.com/v1/url?u=https://help.ubuntu.com/14.04/serverguide/certificates-and-security.html&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=RoJw%2FW1FRudTnLiaRwnUtv3RFD0IwB0qdHV7Fhpzf14%3D%0A&s=cda5b02e866ec8f0bb4c4c8986252a3ecbe2094882470b9113cb0272bde0473a>
>>> .
>>>
>>> I'll modify
>>>
>>> http://webwork.maa.org/wiki/Installation_Manual_for_2.9_on_Ubuntu_14.04#Create_a_self-signed_Certificate
>>> <https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/wiki/Installation_Manual_for_2.9_on_Ubuntu_14.04%23Create_a_self-signed_Certificate&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=RoJw%2FW1FRudTnLiaRwnUtv3RFD0IwB0qdHV7Fhpzf14%3D%0A&s=b77ab855af9192dc943eda36e4a53a37cd5ca2862143a64f1a77dba848492550>
>>> accordingly.  I'm not sure how much of what I did was needed.
>>>
>>> First I tried pointing SSLCACertificateFile to my original self signed
>>> certificate which some people say should work.  It didn't but I have read
>>> that the SSLCACertificateFile needs to be a .pem file and my file was a
>>> .crt file.  Maybe I should try generating a self signed pem file and point
>>> both SSLCACertificateFile and SSLCertificateFile there.
>>>
>>> But at least I have something that works.
>>>
>>> Arnie
>>>
>>>
>>> On Wed, Aug 27, 2014 at 5:53 PM, John Jones <jj at asu.edu> wrote:
>>>
>>>> I the problem arises from the ajax call, which is generated by jquery.
>>>>  I think the configuration change has to either be done when we send the
>>>> request (so in jquery's $.post command) or in the receiver, which is apache.
>>>>
>>>> John
>>>>
>>>>
>>>>
>>>> On Wed, Aug 27, 2014 at 12:33 PM, Arnold Pizer <
>>>> apizer at math.rochester.edu> wrote:
>>>>
>>>>> Hi Jason,
>>>>>
>>>>> No, I still get the same error. I also tried setting in
>>>>> webwork.apache2.4-conf
>>>>> PerlSetEnv PERL_LWP_SSL_VERIFY_HOSTNAME 0
>>>>> and a few similar things all to no avail.
>>>>>
>>>>> Arnie
>>>>>
>>>>>
>>>>> On Wed, Aug 27, 2014 at 2:45 PM, Jason Aubrey <aubreyja at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Arnie,
>>>>>>
>>>>>> We think might have a general solution, and you might be in the best
>>>>>> position to test it. In line 143 of WebworkClient.pm could you put
>>>>>>
>>>>>> ssl_opts => { verify_hostname => 0 }
>>>>>>
>>>>>> inside the ->proxy() bit.  So I think it should look like
>>>>>>
>>>>>> -> proxy(($self->url).'/'.REQUEST_URI,ssl_opts => { verify_hostname
>>>>>> => 0 } );
>>>>>>
>>>>>> The ssl_opts should get passed to LWP::UserAgent and maybe disable
>>>>>> the hostname verification for the web service calls.
>>>>>>
>>>>>> Jason
>>>>>>
>>>>>>
>>>>>> On Wed, Aug 27, 2014 at 11:34 AM, Arnold Pizer <
>>>>>> apizer at math.rochester.edu> wrote:
>>>>>>
>>>>>>> Thanks.  After sending the email, I realized that the problem wasn't
>>>>>>> with the browser but figured someone with a deeper understanding would
>>>>>>> respond.
>>>>>>>
>>>>>>> When we figure this out, it would be good if we could make a
>>>>>>> configuration option that  (1) disables hostname verification or
>>>>>>> (2) does something else to make this problem easier to solve.
>>>>>>>
>>>>>>> Arnie
>>>>>>>
>>>>>>>
>>>>>>> On Wed, Aug 27, 2014 at 2:19 PM, Jason Aubrey <aubreyja at gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> I'll need to track down who really needs the cert, but in this case
>>>>>>>> it's not the browser.  I *think* it's LWP::UserAgent via
>>>>>>>> LWP::Protocol::https.  You can see here
>>>>>>>>
>>>>>>>>
>>>>>>>> http://search.cpan.org/~mschilli/LWP-Protocol-https-6.06/lib/LWP/Protocol/https.pm
>>>>>>>> <https://urldefense.proofpoint.com/v1/url?u=http://search.cpan.org/~mschilli/LWP-Protocol-https-6.06/lib/LWP/Protocol/https.pm&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=qcv1sUmY2mmPdAagwB7DjEHK%2FmPDlw6Qt7YtABKv6do%3D%0A&s=694e0ff4bb49d7042a44336317f7c7cc829d5d813697e43c845370e10f27db8d>
>>>>>>>>
>>>>>>>> It's description of how ssl requests can fail (which sounds like
>>>>>>>> how ours are failing.)  So, the deeper solution might be to fix it here by
>>>>>>>> disabling the check:
>>>>>>>>
>>>>>>>> If hostname verification is requested by LWP::UserAgent's ssl_opts,
>>>>>>>>> and neither SSL_ca_file nor SSL_ca_path is set, then SSL_ca_file
>>>>>>>>> is implied to be the one provided by Mozilla::CA. If the Mozilla::CA module
>>>>>>>>> isn't available SSL requests will fail. Either install this module, set up
>>>>>>>>> an alternative SSL_ca_file or disable hostname verification
>>>>>>>>>
>>>>>>>>
>>>>>>>> That's if I'm right about who is complaining.
>>>>>>>>
>>>>>>>> Jason
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, Aug 27, 2014 at 11:08 AM, Arnold Pizer <
>>>>>>>> apizer at math.rochester.edu> wrote:
>>>>>>>>
>>>>>>>>> Hi John et all,
>>>>>>>>>
>>>>>>>>> I'm pretty sure I'm having the same problem.  When I look at
>>>>>>>>> things following Matt's suggestion, I see that the last module called is instructorXMLHandler.pm
>>>>>>>>> and I see the error msg
>>>>>>>>> Errors: 500 Can't connect to 192.168.56.101:443
>>>>>>>>> <https://urldefense.proofpoint.com/v1/url?u=http://192.168.56.101:443&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=qcv1sUmY2mmPdAagwB7DjEHK%2FmPDlw6Qt7YtABKv6do%3D%0A&s=e09084ada64c076fd5495663842d43b8ab6e007ddf6f5804a79eb17d6621ab9a>
>>>>>>>>> (certificate verify failed) at /opt/webwork/webwork2/lib/WebworkClient.pm
>>>>>>>>> line 158. End Errors
>>>>>>>>>
>>>>>>>>> My problem is that I'm using a selfsigned certificate for testing.
>>>>>>>>>  So I don't think creating a self signed SSLCA certificate alone will solve
>>>>>>>>> the problem.  I think I should be able to get the browser to trust the
>>>>>>>>> certificate and if this works it will be OK as long as only instructors
>>>>>>>>> have this problem.  Are there any things that students do (or will do) that
>>>>>>>>> will bring up similar problems?  If so, the option of using self signed
>>>>>>>>> certificates will have to be abandoned.
>>>>>>>>>
>>>>>>>>> If anyone has gotten a browser to trust a self signed certificate
>>>>>>>>> or can point me to a good reference, I would appreciate the hint.  There
>>>>>>>>> seem to be quite a few references, but I haven't found one that works yet.
>>>>>>>>>  At least now I know the problem is really with the SSL certificate.
>>>>>>>>>
>>>>>>>>> Arnie
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Wed, Aug 27, 2014 at 11:50 AM, John Jones <jj at asu.edu> wrote:
>>>>>>>>>
>>>>>>>>>> Can someone write a version of this explanation a la an apache
>>>>>>>>>> for dummies?
>>>>>>>>>>
>>>>>>>>>> Arnie, can you check to see if this fixes the problem you
>>>>>>>>>> encountered during mathfest?
>>>>>>>>>>
>>>>>>>>>> John
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Wed, Aug 27, 2014 at 8:40 AM, Jason Aubrey <aubreyja at gmail.com
>>>>>>>>>> > wrote:
>>>>>>>>>>
>>>>>>>>>>> Thanks Matt - that worked!
>>>>>>>>>>>
>>>>>>>>>>> Jason
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Tue, Aug 26, 2014 at 4:56 PM, Matt Haught <
>>>>>>>>>>> matt_haught at ncsu.edu> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Same problem here on our devel server but not our production. I
>>>>>>>>>>>> have
>>>>>>>>>>>> been scratching my head with it today.  Our devel server also
>>>>>>>>>>>> uses the
>>>>>>>>>>>> incommon certs while the production is using godaddy from
>>>>>>>>>>>> before we
>>>>>>>>>>>> could get incommon.  So that got me thinking...  I have
>>>>>>>>>>>> something for
>>>>>>>>>>>> you to try that appears to have worked for us.
>>>>>>>>>>>>
>>>>>>>>>>>> Add a SSLCACertificateFile apache conf line and have it use the
>>>>>>>>>>>> intermediate/root only cert (2nd link down in the InCommon
>>>>>>>>>>>> email)
>>>>>>>>>>>>
>>>>>>>>>>>> Matt Haught
>>>>>>>>>>>> North Carolina State University
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On Tue, Aug 26, 2014 at 5:49 PM, Jason Aubrey <
>>>>>>>>>>>> aubreyja at gmail.com> wrote:
>>>>>>>>>>>> > Well, at this point I think the error has something to do
>>>>>>>>>>>> with how my ssl is
>>>>>>>>>>>> > configured.  Here is some evidence from my apache log with
>>>>>>>>>>>> LogLevel info:
>>>>>>>>>>>> >
>>>>>>>>>>>> > There were a lot of errors: 500 Can't connect to
>>>>>>>>>>>> > webwork.math.arizona.edu:443
>>>>>>>>>>>> <https://urldefense.proofpoint.com/v1/url?u=http://webwork.math.arizona.edu:443&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=hIi8Y6c%2BF6urweTkKtsDeHM2YeEf66fH%2BdSLpZNJEOE%3D%0A&s=659704ee979814c39994ceb4ce07d99d6c2c6560c6cac50cdf09c2cb8a72a7bf>
>>>>>>>>>>>> at /opt/webwork/webwork2/lib/WebworkClient.pm
>>>>>>>>>>>> > line 158
>>>>>>>>>>>> >
>>>>>>>>>>>> > [Tue Aug 26 14:35:13 2014] [info] [client 127.0.0.1] SSL
>>>>>>>>>>>> library error 1 in
>>>>>>>>>>>> > handshake (server webwork.math.arizona.edu:443
>>>>>>>>>>>> <https://urldefense.proofpoint.com/v1/url?u=http://webwork.math.arizona.edu:443&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=hIi8Y6c%2BF6urweTkKtsDeHM2YeEf66fH%2BdSLpZNJEOE%3D%0A&s=659704ee979814c39994ceb4ce07d99d6c2c6560c6cac50cdf09c2cb8a72a7bf>
>>>>>>>>>>>> )
>>>>>>>>>>>> > [Tue Aug 26 14:35:13 2014] [info] SSL Library Error: 336151576
>>>>>>>>>>>> > error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert
>>>>>>>>>>>> unknown ca
>>>>>>>>>>>> > [Tue Aug 26 14:35:13 2014] [info] [client 127.0.0.1]
>>>>>>>>>>>> Connection closed to
>>>>>>>>>>>> > child 0 with abortive shutdown (server
>>>>>>>>>>>> webwork.math.arizona.edu:443
>>>>>>>>>>>> <https://urldefense.proofpoint.com/v1/url?u=http://webwork.math.arizona.edu:443&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=hIi8Y6c%2BF6urweTkKtsDeHM2YeEf66fH%2BdSLpZNJEOE%3D%0A&s=659704ee979814c39994ceb4ce07d99d6c2c6560c6cac50cdf09c2cb8a72a7bf>
>>>>>>>>>>>> )
>>>>>>>>>>>> >
>>>>>>>>>>>> > So, you can see (1) that 'it' can't connect to
>>>>>>>>>>>> webwork.math.arizona.edu:443
>>>>>>>>>>>> <https://urldefense.proofpoint.com/v1/url?u=http://webwork.math.arizona.edu:443&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=hIi8Y6c%2BF6urweTkKtsDeHM2YeEf66fH%2BdSLpZNJEOE%3D%0A&s=659704ee979814c39994ceb4ce07d99d6c2c6560c6cac50cdf09c2cb8a72a7bf>
>>>>>>>>>>>> > and (2) the ssl handshake seems to be dying due to an unknown
>>>>>>>>>>>> certificate
>>>>>>>>>>>> > authority.  But if you looked at my server, you would see (3)
>>>>>>>>>>>> that my
>>>>>>>>>>>> > certificate authority is in fact well known:
>>>>>>>>>>>> >>
>>>>>>>>>>>> >> Issued By
>>>>>>>>>>>> >>
>>>>>>>>>>>> >> Common Name (CN) InCommon Server CA
>>>>>>>>>>>> >>
>>>>>>>>>>>> >> Organizaton (O) Internet2
>>>>>>>>>>>> >>
>>>>>>>>>>>> >> etc...
>>>>>>>>>>>> >
>>>>>>>>>>>> > Also, there is the fact that (4) my web browsers have no
>>>>>>>>>>>> problem connecting
>>>>>>>>>>>> > to the https site.
>>>>>>>>>>>> > So,
>>>>>>>>>>>> > (a) Maybe the perl module(s) running the webservice calls
>>>>>>>>>>>> (LWP?) don't
>>>>>>>>>>>> > recognize the certificate authority.
>>>>>>>>>>>> > (b) Maybe the way my redirect to ssl is set up is messing
>>>>>>>>>>>> with the web
>>>>>>>>>>>> > service calls. (Permanent redirect to a *:443 vhost)
>>>>>>>>>>>> > (c) Maybe there is some other configuration problem with my
>>>>>>>>>>>> ssl set up.
>>>>>>>>>>>> > (d) Maybe this is completely unrelated to the actual problem.
>>>>>>>>>>>> >
>>>>>>>>>>>> > Thanks for any ideas.
>>>>>>>>>>>> > Jason
>>>>>>>>>>>> >
>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>> webwork-devel mailing list
>>>>>>>>>>>> webwork-devel at webwork.maa.org
>>>>>>>>>>>> http://webwork.maa.org/mailman/listinfo/webwork-devel
>>>>>>>>>>>> <https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/mailman/listinfo/webwork-devel&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=hIi8Y6c%2BF6urweTkKtsDeHM2YeEf66fH%2BdSLpZNJEOE%3D%0A&s=f02b3d4aa31c9f5bdb0b9e2da8bbe66c3f5c55044c9d192f6f36541793737fbd>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>> webwork-devel mailing list
>>>>>>>>>>> webwork-devel at webwork.maa.org
>>>>>>>>>>> http://webwork.maa.org/mailman/listinfo/webwork-devel
>>>>>>>>>>> <https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/mailman/listinfo/webwork-devel&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=hIi8Y6c%2BF6urweTkKtsDeHM2YeEf66fH%2BdSLpZNJEOE%3D%0A&s=f02b3d4aa31c9f5bdb0b9e2da8bbe66c3f5c55044c9d192f6f36541793737fbd>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> webwork-devel mailing list
>>>>>>>>>> webwork-devel at webwork.maa.org
>>>>>>>>>>
>>>>>>>>>> https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/mailman/listinfo/webwork-devel&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=hIi8Y6c%2BF6urweTkKtsDeHM2YeEf66fH%2BdSLpZNJEOE%3D%0A&s=f02b3d4aa31c9f5bdb0b9e2da8bbe66c3f5c55044c9d192f6f36541793737fbd
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Prof. Arnold K. Pizer
>>>>>>>>> Dept. of Mathematics
>>>>>>>>> University of Rochester
>>>>>>>>> Rochester, NY 14627
>>>>>>>>> (585) 766-8812
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> webwork-devel mailing list
>>>>>>>>> webwork-devel at webwork.maa.org
>>>>>>>>> http://webwork.maa.org/mailman/listinfo/webwork-devel
>>>>>>>>> <https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/mailman/listinfo/webwork-devel&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=qcv1sUmY2mmPdAagwB7DjEHK%2FmPDlw6Qt7YtABKv6do%3D%0A&s=9c972ecbed0fdbb30c086953ea4315f9ae5d19e9d5bba619d57c28a460e32459>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> webwork-devel mailing list
>>>>>>>> webwork-devel at webwork.maa.org
>>>>>>>>
>>>>>>>> https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/mailman/listinfo/webwork-devel&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=qcv1sUmY2mmPdAagwB7DjEHK%2FmPDlw6Qt7YtABKv6do%3D%0A&s=9c972ecbed0fdbb30c086953ea4315f9ae5d19e9d5bba619d57c28a460e32459
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Prof. Arnold K. Pizer
>>>>>>> Dept. of Mathematics
>>>>>>> University of Rochester
>>>>>>> Rochester, NY 14627
>>>>>>> (585) 766-8812
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> webwork-devel mailing list
>>>>>>> webwork-devel at webwork.maa.org
>>>>>>> http://webwork.maa.org/mailman/listinfo/webwork-devel
>>>>>>> <https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/mailman/listinfo/webwork-devel&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=KO2RS6ixedrUyvT4arnoHWxFGWY%2BKXWHdd258XPl4sA%3D%0A&s=9fe3159f2d9a66ce99574df5e5079e1082892345249a223a33d5f01b48a2345d>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> webwork-devel mailing list
>>>>>> webwork-devel at webwork.maa.org
>>>>>>
>>>>>> https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/mailman/listinfo/webwork-devel&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=KO2RS6ixedrUyvT4arnoHWxFGWY%2BKXWHdd258XPl4sA%3D%0A&s=9fe3159f2d9a66ce99574df5e5079e1082892345249a223a33d5f01b48a2345d
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Prof. Arnold K. Pizer
>>>>> Dept. of Mathematics
>>>>> University of Rochester
>>>>> Rochester, NY 14627
>>>>> (585) 766-8812
>>>>>
>>>>> _______________________________________________
>>>>> webwork-devel mailing list
>>>>> webwork-devel at webwork.maa.org
>>>>> http://webwork.maa.org/mailman/listinfo/webwork-devel
>>>>> <https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/mailman/listinfo/webwork-devel&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=sPqxTKzP%2BXUkKQzphH%2B0Vf%2BHx8y0AjIPpgR8Sic8eSY%3D%0A&s=94c62b5b43b030e6c4d27f9579ee92b47860f672b55a1385bba5bc7384c68d1c>
>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> webwork-devel mailing list
>>>> webwork-devel at webwork.maa.org
>>>>
>>>> https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/mailman/listinfo/webwork-devel&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=sPqxTKzP%2BXUkKQzphH%2B0Vf%2BHx8y0AjIPpgR8Sic8eSY%3D%0A&s=94c62b5b43b030e6c4d27f9579ee92b47860f672b55a1385bba5bc7384c68d1c
>>>>
>>>>
>>>
>>>
>>> --
>>> Prof. Arnold K. Pizer
>>> Dept. of Mathematics
>>> University of Rochester
>>> Rochester, NY 14627
>>> (585) 766-8812
>>>
>>> _______________________________________________
>>> webwork-devel mailing list
>>> webwork-devel at webwork.maa.org
>>> http://webwork.maa.org/mailman/listinfo/webwork-devel
>>> <https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/mailman/listinfo/webwork-devel&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=RoJw%2FW1FRudTnLiaRwnUtv3RFD0IwB0qdHV7Fhpzf14%3D%0A&s=8e712d8e68ae1cd810da77d37023b5cfa9d019748004c8e6168a725b1b26726e>
>>>
>>>
>>
>> _______________________________________________
>> webwork-devel mailing list
>> webwork-devel at webwork.maa.org
>>
>> https://urldefense.proofpoint.com/v1/url?u=http://webwork.maa.org/mailman/listinfo/webwork-devel&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=g5j9%2FzBITNFXnOqzhQf%2B0b%2F2j5jSmy74eqJk2rpyoc4%3D%0A&m=RoJw%2FW1FRudTnLiaRwnUtv3RFD0IwB0qdHV7Fhpzf14%3D%0A&s=8e712d8e68ae1cd810da77d37023b5cfa9d019748004c8e6168a725b1b26726e
>>
>>
>
>
> --
> Prof. Arnold K. Pizer
> Dept. of Mathematics
> University of Rochester
> Rochester, NY 14627
> (585) 766-8812
>



-- 
Prof. Arnold K. Pizer
Dept. of Mathematics
University of Rochester
Rochester, NY 14627
(585) 766-8812
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