[ww-devel] The library browser not updating problem
Arnold Pizer
apizer at math.rochester.edu
Thu Aug 28 15:35:12 EDT 2014
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
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