safari browser crashing consistently

Was trying to add some nifty jquery slider and all seemed great except safari on ipad was crashing consistently. This answer on StackOverflow was the key:

Finally found it wasn’t the javascript or any weird characters, but the CSS

-webkit-transform

in our case. After removing that, safari did not crash any more, hurray.

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ESXi Console: Unable to connect to the MKS: A general system error occurred: Internal error

When trying to connect to the console of any virtual on the host:
Unable to connect to the MKS: A general system error occurred: Internal error
Had to sift through quite a few solutions that didn’t help to finally find this one that did:

log in with ssh:
# vdf -h
-----
Ramdisk Size Used Available Use% Mounted on
root 32M 32M 0B 100% --
etc 28M 224K 27M 0% --
tmp 192M 37M 154M 19% --
hostdstats 413M 3M 409M 0% --

# cd /
# ls -la
.... look in the results - I see 1 very large file, MegaSAS.log
# rm MegaSAS.log
# vdf -h
-----
Ramdisk Size Used Available Use% Mounted on
root 32M 748K 31M 2% --
etc 28M 228K 27M 0% --
tmp 192M 3M 188M 1% --
hostdstats 413M 4M 408M 1% --

Then I also had to undo the unchecking of the SSL box that some sites advised, without it checked, I was getting an SSL error!

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QNAP RAID rebuild way too slow, resolved

In an 8-drive Qnap TS 879 Pro, we had a drive fail. After replacing the drive, the rebuild started automatically. A couple hours later, the status showed only 1% rebuilt. At this rate, it will take a week to rebuild – that’s no good, what if another drive fails in the meanwhile?

Searching brought me to this page that explains how to improve this. We logged into the unit as user admin and executed the following command:
echo 40000 > /proc/sys/dev/raid/speed_limit_min

Then monitoring with cat /proc/mdstat I saw the “finish” value drop from over 8800 minutes to less than 1400. Now the rebuild should be done in one day instead of one week.

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Endicia Dazzle not working because connections to symcb.com and symcd.com blocked

We had an application (Dazzle) on a firewalled Windows 7 computer that was failing due to an unknown error. We’d already whitelisted the domains as suggested by Endicia here . Analyzing the problem, we found connections to se.symcb.com/se.crl and se.symcd.com being blocked.

Investigating this we determined that the domains are owned by Symantec Corporation and are used in the process of verifying secure certificates, more specifically, the ‘Certificate Revocation List’. We found that whenever the program starts, it tries to make this connection. After whitelisting the domains in our local proxy, the program worked normally.

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Postscript file not printing / duplexing- Resolved

I’m working with an old vb program that produces and outputs a postscript file to a printer. With the old printer, the file always printed on both sides of the paper. We tested some new printers and some models printed on both sides whereas others would print two single-sided pages. Tracking down the cause was a challenge so I’m noting it here in case this ever comes up again, or might be of help to anyone.

First it wouldn’t print at all, so we turned on the printer’s postscript debugging option and that output a page with the following note:

ERROR: configurationerror
OFFENDING COMMAND: setpagedevice
ERRORINFO: Key= /PageSize Value = arraytype
STACK:
dicttype

I found the paper size hard coded in our program and I updated it to the new paper size. Then it started printing single-sided two sheets.

In our program that generates the postscript, for each side of the page was something like this:

"%%BeginPageSetup" & vbCrLf & _
"<< /Duplex true >> setpagedevice" & vbCrLf & _
"<< /Tumble true >> setpagedevice" & vbCrLf & _
"90 rotate" & vbCrLf & _
"/pagelevel save def" & vbCrLf & _
"%%EndPageSetup" & vbCrLf & _

I found the solution to getting the duplexing to work is to remove the “Duplex true” call from the second page. Changed the front page to:

"%%BeginPageSetup" & vbCrLf & _
"<< /Duplex true /Tumble true >> setpagedevice" & vbCrLf & _
"90 rotate" & vbCrLf & _
"/pagelevel save def" & vbCrLf & _
"%%EndPageSetup" & vbCrLf & _

and removed the Duplex / Tumble line from the back page and it worked, the program now prints on both sides of the paper, yes!!

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Where is busybox on vmware ESXi 5.1?

On ESXi 5.0, busybox is in /usr/bin but on ESXi 5.1 it’s a bit deeper,
/usr/lib/vmware/busybox/bin/busybox

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Call to undefined method WooCommerce::mfunc_wrapper() in header.php

After updating a wordpress site using the WooCommerce plugin, the site would no longer load. Searching the web showed that many others have had the same error. Tried a variety of solutions, nothing other than restoring the downgraded site worked; but since I didn’t want to downgrade to potentially unsecure plugins, I took matters into my own hands.

I commented out the function “WooCommerce::mfunc_wrapper” in header.php on line 58

## $woocommerce->mfunc_wrapper( ‘superstore_mini_cart()’, ‘superstore_mini_cart’, $woocommerce );

and now the site loads with no errors!

Apparently this is due to an outdated ‘wootique’ theme or some other related outdated plugin or theme that doesn’t tell wordpress it needs an update. At least commenting it out restores site functionality.

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Copy an Amazon EC2 instance to a new region

I thought this would be easier than it turned out to be. Documenting my steps here in case I need to do this again someday.

I had a running Amazon EC2 instance and I want to copy it for possible migration to a different Amazon region.

I created the snapshot of the boot drive, and copied that over to the desired destination region. Then I created an image from the snapshot and tried to launch that image with the default kernel option. The system starts running but fails 1/2 checks and is not reachable. I looked around and found some similar cases:
https://forums.aws.amazon.com/thread.jspa?messageID=452648
https://forums.aws.amazon.com/thread.jspa?messageID=292162
https://forums.aws.amazon.com/thread.jspa?messageID=388700

These posts clued me in to the kernel. I found which Amazon kernel image the source is running, but that kernel can’t be found in the destination region. At first I thought maybe it’s obsolete, or region-specific, but then I figured out how to find the correct kernel in the new region.

Look at the source instance in the source region, and find the AMI ID in the instance description. In my case it is
ubuntu-lucid-10.04-i386-server-20101020 (ami-8c0c5cc9)

Switch to the destination region and view the AMIs, switch to public AMIs and search based on the description (ubuntu-lucid-10.04-i386-server-20101020)
This brings up 2 results, I’m looking for the ‘ebs’ result.

Click on it and in the Details look for the Kernel ID, in my case it is aki-6603f70f

Now I can launch my snapshot-sourced AMI and choose this kernel ID under Advanced. My server comes up and passes 2/2 checks now, but I still can’t connect. I’m getting “Connection refused” even though the same security group allows me to connect to a neighboring instance.

This explained it for me: http://stackoverflow.com/questions/14026148/running-ec2-instance-suddenly-refuses-ssh-connection

I had to temporarily attach the volume to a different running instance in the same region & zone so that I could modify /etc/fstab to remove the defunct entries. After doing this, I re-attached the volume to the new instance as /dev/sda1 and then it booted with 2/2 checks passing and I am able to connect using SSH.

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argument list too long – one possible solution

Sometimes when trying to do stuff with lots of files, I see the subject error. I’ve found that you can sometimes have better results if you are in the directory so that there is no path in your argument, i.e.

# mv /media/old_raw/back/* /media/raw/back/
bash: /bin/mv: Argument list too long

# cd /media/old_raw/back/
# mv * /media/raw/back/

Success!

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rtorrent stopped uploading: “Could not lock session directory”

We noticed our torrents stopped uploading. When I try to run rtorrent via /etc/init.d it just seems like it restarts, but it’s still not listening on the designated port. I enter the command manually, something like

rtorrent -n -o bind=192.168.1.2,port_range=44443-44443,directory=/home/user,session=/home/user/.rtorrent-session,peer_exchange=yes,scgi_port=127.0.0.1:16789

Then I get back the error:
rtorrent: Could not lock session directory: "/home/user/.rtorrent-session/", held by "xyzpdq".

Turns out there is a lock file that needs to be removed; apparently the previous run crashed without removing it, so,

rm /home/user/.rtorrent-session/rtorrent.lock

And now the rtorrent program starts normally from /etc/init.d

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