[ww-devel] The library browser not updating problem

Jason Aubrey aubreyja at gmail.com
Thu Aug 28 17:28:56 EDT 2014 

On Thu, Aug 28, 2014 at 2:19 PM, Arnold Pizer <apizer at math.rochester.edu>
wrote:

> 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
>

If you reverse your earlier changes do you still get this behavior or do
both fail?  I ask because redirects which take

http://webwork.place.edu/webwork2

to

https://webwork.place.edu/webwork2

won't redirect

http://webwork.place.edu/mod_xmlrpc

to

https://webwork.place.edu/mod_xmlrpc.

So, I think the non-https version for $server_root_url should always work
when we're just redirecting /webwork2 to https.

Jason

>
>
> 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
>
> _______________________________________________
> webwork-devel mailing list
> webwork-devel at webwork.maa.org
> http://webwork.maa.org/mailman/listinfo/webwork-devel
>
>
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