[ww-devel] webwork-devel Digest, Vol 41, Issue 26

goehle at gmail.com goehle at gmail.com
Thu Aug 28 16:53:24 EDT 2014 

This isn't my strong suit, so maybe someone else can correct me, but the
issue is that the verification of the hostname is failing.  So when you
change from the ip address to localhost its trying to verify two different
things somehow (localhost vs. whatever hostname it decides is associated to
the ip).

I tested the pull request on a couple of machines, including one with a
self signed certificate and server url https://localhost, so hopefully it
will work for you.

Geoff.


On Thu, Aug 28, 2014 at 3:36 PM, <webwork-devel-request at webwork.maa.org>
wrote:

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>    1. Re: The library browser not updating problem (Arnold Pizer)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 28 Aug 2014 15:35:12 -0400
> From: Arnold Pizer <apizer at math.rochester.edu>
> To: WeBWorK development discussion <webwork-devel at webwork.maa.org>
> Subject: Re: [ww-devel] The library browser not updating problem
> Message-ID:
>         <
> CAG14sPtvvW006nmRyN1a8bovOhqMon3qBJLDD0sxyouZf3BMGw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> 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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> ------------------------------
>
> _______________________________________________
> webwork-devel mailing list
> webwork-devel at webwork.maa.org
> http://webwork.maa.org/mailman/listinfo/webwork-devel
>
>
> End of webwork-devel Digest, Vol 41, Issue 26
> *********************************************
>
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