Iwlist scan fails when there too many wireless networks

$ sudo iwlist wlan0 scan
print_scanning_info: Allocation failed
wicd uses iwlist to scan networks but iwlist fails when there are too many networks. This seems to be an old issue. Is there a fix for this?
Thanks.

There's a fix yes. For wireless_tools-29 there's a patch somewhere. Or you install wireless_tools-30pre9

Similar Messages

FTP Put fails when there is no pre-existing file present in the directory

Hi All,
In our process we use the FTP adapter to write a file to a location. This operation fails when there is no preexisting file on the output directory.
So we placed a zero byte file on the directory and tested and the adapter was able to create the output file but when the files were deleted from the output directory the file transfer failed again.
We got the below error
Non Recoverable System Fault :
Exception occured when binding was invoked. Exception occured during invocation of JCA binding: "JCA Binding execute of Reference operation 'Put' failed due to: Invalid Output Directory. Invalid Output Directory. The value specified for the output (Physical/Logical)Directory interaction parameter or jca binding property has an invalid value "XXXXXXXXXXXXXXX" Ensure that the following conditions are satisfied for the output directory : 1) It exists and is a directory (not a file). and 2) It is writable (file write permissions). and 3) If using a logical name, then ensure that the mapping from logical name<->physical directory is correctly specified in the deployment descriptor. ". The invoked JCA adapter raised a resource exception. Please examine the above error message carefully to determine a resolution.
Kindly help us resolve the issue.
Thanks in advance.
Regards,
Balaji R

Balaji,
This operation fails when there is no preexisting file on the output directory I'm not sure I understood this declaration.
Why do you need to have preexisting file on the output directory?
If it fails, with the mentioned error, it means that something was not defined properly.
OR
Another option is permissions.
Check that your local system user (I guess orabi) has a write permission on the target directory (on the FTP host).
Arik

If I got an unlocked iPhone 4s would I be able to use a 3G network? Like so when there is no wifi network can I use a 3G network if I got an unlocked iPhone? Or do you have to have a locked iPhone to do this?

if I got an unlocked iPhone 4s would I be able to use a 3G network? Like so when there is no wifi network can I use a 3G network to go on the internet when i am out if I got an unlocked iPhone? Or do you have to have a locked iPhone to do this?

If I am reading your question correctly, yes if there is no wifi
you can use 3G IF you have a contract with a wireless provider
and the appropriate SIM card if required. Being unlocked does not
give you access to 3G for free; you still have to pay for it. Same
for locked iPhone. Difference is that you would have to get contract
with whatever provider the iPhone is locked to if you have locked
iPhone; if iPhone is unlocked, you will have to make a choice from
your local providers.
If this does not answer your questions, please post back with more
details and someone will answer you.

HT3204 I got a reading of "secure link to iTunes store failed" when I ran a diagnostic "network connectivity" test. What's wrong and how do I fix it? I am indeed unable to connect to the store.

Can anyone help me figure out what's wrong when I try to connect to the iTunes store? I got a message "secure link to iTunes store failed" when I ran a diagnostic "network connectivity" text. What's wrong?
Thanks for any help you can give me!

With those symptoms, I'd try the following document:
Apple software on Windows: May see performance issues and blank iTunes Store
(If there's a SpeedBit LSP showing up in Autoruns, it's usually best to just uninstall your SpeedBit Video Accelerator.)

I have a mountain lion 10.8.5 version installed on my 2012 Macbook air but there is no Wireless Network application installed. Can anyone advise me how to fix this or get it installed, thanks.

I have a mountain lion 10.8.5 version installed on my 2012 Macbook air but there is no Wireless Network application installed. Can anyone advise me how to fix this or get it installed, thanks.

thank you Eric/Joe, what I actually was looking for is wireless diagnostic utility not the wireless diagnostic assistant as per your advise but have found the resolution right here http://support.apple.com/kb/HT5606

HT4623 When I joined my wireless network I set authentication required to on and di not eneter a username or password. I then went into safari and as requested entered my username and password. Now,however the iPod is remembering my credentials. How do

When I joined my wireless network I set authentication required to on and di not eneter a username or password. I then went into safari and as requested entered my username and password. Now,however the iPod is remembering my credentials. How do I clear my credentials?

Go to Settings>Safari and Clear History, Cookies and Data
Also go to Settings>Safari>AutoFill and Make sure that Names and Passwords are OFF and Clear All.

HT201436 call gets dropped too many times ,network is alright

call gets dropped too many times ,network is alright

It is also relatively easily to dial 911 during the palm reset process as well. Maybe a confirmation screen would be nice.

DB_GET_BOTH_RANGE fails when there is only one record for a key

Using the DB_GET_BOTH_RANGE flag doesn't seem to work when there is a
single record for a key.
Here's a sample Python program that illustrates the problem. If you
don't know Python, then consider this to be pseudo code. :)
from bsddb3 import db
import os
env = db.DBEnv()
os.mkdir('t')
env.open('t',
db.DB_INIT_LOCK | db.DB_INIT_LOG | db.DB_INIT_MPOOL |
db.DB_INIT_TXN | db.DB_RECOVER | db.DB_THREAD |
db.DB_CREATE | db.DB_AUTO_COMMIT)
data = db.DB(env)
data.set_flags(db.DB_DUPSORT)
data.open('data', dbtype=db.DB_HASH,
flags=(db.DB_CREATE | db.DB_THREAD | db.DB_AUTO_COMMIT |
db.DB_MULTIVERSION),
txn = env.txn_begin()
#data.put('0', '6ob 0 rev 6', txn)
data.put('0', '7ob 0 rev 7', txn)
#data.put('0', '8ob 0 rev 8', txn)
data.put('1', '9ob 1 rev 9', txn)
txn.commit()
cursor = data.cursor()
print cursor.get('0', '7', flags=db.DB_GET_BOTH_RANGE)
cursor.close()
data.close()
env.close()
This prints None, indicating that the record who's key is '0' and
who's data begins with '7' couldn't be found. If I uncomment wither of
the commented out puts, so that there is more than one record for the
key, then the get with DB_GET_BOTH_RANGE works.
Is this expected behavior? or a bug?

You can use the DB_SET flag which will look for an exact key match. If
you use it with the DB_MULTIPLE_KEY flag, it will return multiple keys
after the point it gets a match. If you can post here how all your
LIKE QUERIES look, I may be able to provide you with the suited
combination of the flags you can use for them.I'm not doing like queries. I'm using BDB as a back end for an object
database. In the object database, I keep multiple versions of object
records tagged by timestamp. The most common query is to get the
current (most recent version) for an object, but sometimes I want the
version for a specific timestamp or the latest version before some
timestamp.
I'm leveraging duplicate keys to implement a nested mapping:
{oid -> {timestamp -> data}}
I'm using a hash access method for mapping object ids to a collection
of time stamps and data. The mapping of timestamps to data is
implemented as duplicate records for the oid key, where each record is
an 8-byte inverse timestamp concatenated with the data. The inverse
timestamps are constructed in such a way that they sort
lexicographically in inverse chronological order. So there are
basically 3 kinds of query:
A. Get the most recent data for an object id.
B. Get the data for an object id and timestamp.
C. Get the most recent data for an object id who's timestamp is before
a given timestamp.
For query A, I can use DB->get.
For query B, I want to do a prefix match on the values. This can be
thought of as a like query: "like <inverse-time-stamp>%", but it can
also be modelled as a range search: "get the smallest record that is >=
a given inverse time stamp". Of course, after such a range search,
I'd have to check whether the inverse time stamp matches.
For query C, I really want to do a range search on the inverse time
stamp prefixes. This cannot be modelled as a like query.
I could model this instead as {oid+timestamp -> data}, but then I'd
have to use the btree access method, and I don't expect that to scale
as I'll have hundreds of millions of objects.
We tried using BDB as a back end for our database (ZODB) several years
ago and it didn't scale well. I think there were 2 reasons for
this. First, we used the btree access method for all of our
databases. Second, we used too many tables. This time, I'm hoping that
the hash access method and a leaner design will provide better
scalability. We'll see. :)
If you want to start
on a key partial match you should use the DB_SET_RANGE flag instead of
the DB_SET flag.I don't want to do a key partial match.
Indeed, with DB_GET_BOTH_RANGE you can do partial
matches in the duplicate data set and this should be used only if you
look for duplicate data sets.I can't know ahead of time whether there will be duplicates for an
object. So, that means I have to potentially do the query 2 ways,
which is quite inconvenient.
As you saw, the flags you can use with cursor.get are described in
detailed here.But it wasn't at all clear from the documentation that
DB_GET_BOTH_RANGE wouldn't work unless there were duplicates. As I
mentioned earlier, I think if this was documented more clearly and
especially of there was an example of how one would work around the
behavior, someone would figure out that behavior wasn't very useful.
What you should know is that the usual piece of
information after which the flags are accessing the records, is the
key. What I advice you is to look over Secondary indexes and Foreign
key indexes, as you may need them in implementing your queries.I don't see how secondary indexes help in this situation.
BDB is
used as the storage engine underneath RDBMS. In fact, BDB was the
first "generic data storage library" implemented underneath MySQL. As
such, BDB has API calls and access methods that can support any RDBMS
query. However, since BDB is just a storage engine, your application
has to provide the code that accesses the data store with an
appropriate sequence of steps that will implement the behavior that
you want.Yup.
Sometimes you may find it unsatisfying, but it may be more
efficient than you think.Sure, I just think the notion that DB_GET_BOTH_RANGE should fail if
the number of records for a key is 1 is rather silly. It's hard for me
to imagine that it would be less efficient to handle the non duplicate
case. It is certainly less efficient to handle this at the application
level, as I'm likely to have to implement this with multiple database
queries. Hopefully, BDB's cache will mitigate this.
Thanks again for digging into this.
Jim

How to improve performance when there are many TextBlocks in ItemsControl items?

Hi,
I'm trying to find a way to improve performance for a situation when there is an ItemsControl using UI and Data virtualization and each item on that control has 36 TextBlocks. Basically the item is a single string. There are so many TextBlocks
to allow assigning different brushes to different parts of the string. Performance of this construction is terrible. I have 37 items visible on the screen and if I try to scroll up or down it scrolls into the black space and then it takes a second or two to
show the items.
I tried different things. For example, the most successful performance-wise was to replace TextBlocks with Borders and then draw bitmaps. In other words, I prepared 127 bitmaps for each character (I need ASCII only) and then I used those bitmaps
to set Border.Backgrounds. It improved performance about 1.5 - 2 times but it consumed much more memory (which is not surprising, of course). Required amount of memory is so big that it throws OutOfMemoryException on 512MB emulator but works on 1GB. As a result
I don't thing it is a good solution.
Another thing that worked perfect is to replace 36 TextBlocks with only 6 TextBlocks. In this case the performance improvement is about 5 - 10 times but I lose the ability to set different colors to different parts of the string. It seems that
the performance degrades dramatically with the increase of number of TextBlocks. Is there another technique to draw strings where literally each character can be of different color with decent performance?
Thank you
Alex

Using Runs inside TextBlocks gives approximately the same improvement as using bitmaps 1.5 - 2 times faster but it is not even close to the case with just a couple of TextBlocks in the ItemsControl item. Any other ideas?
Alex

OCIObjectSetAttr performance deteriorates when binding too many Type params

Hi,
In my application, when I passed a Type Array as parameter to the stored procedure and when the Type Array is large enough(normally 3000 type objects， each objects has about 15 attributes), the OCIObjectSetAttr performance deteriorates large enough from below 1 millisecond to 1~3 miliseconds.
I am using OCI 11gR2, does anyone notice it and know how to optimize it?
Regards,
-Bruce

Hi Steve,
Locking algorithms are used to ensure correct behavior when concurrent threads or processes access and update shared data structures. Too many deadlocks is a symptom of too much contention.
One very effective way to reduce contention (and hence deadlocks) is by careful application design. Here are a few things you can do to improve the situation (these are general suggestions; they may or may not be applicable in your application, but certainly worth considering).
- "contention friendly" data model and data - for example, but choosing random (but unique) keys, you will reduce the contention on the b-tree index for concurrent inserts.
- partitioning the data - if you have n threads, and create n databases, where each thread inserts data into its own database, then you'll dramatically reduce the locking contention. If the data files are on separate spindles, you'll also reduce the IO bottleneck.
- keep transactions short
- hold write locks for the shortest possible duration
It may be worth trying some of these ideas.
The next release of Berkeley DB (version 4.8) is coming soon; it has significant enhancements specifically designed to reduce contention. I'd certainly recommend studying the new features and enhancements and then trying out BDB 4.8.
Hope this helps.
Thanks and warm regards.
ashok joshi
Director, Oracle Berkeley DB development

Financial Batch jobs were failing due to too many files opened

1) This issue started after upgrading the OS from windows 2003 to 2008 and PeopleSoft from 8.49 patch 10 to 8.52 to patch 9

I am also getting same kind of error
Below is the error message:
open of the file E:\Ftp\GL_IMP_571819.Log failed: Too many open files (2,633) GL_JRNL_IMP.PROCESS. GBLdefualt 1900-01-01.Import.On Execute PCPC:52127 statement:7333

Can I use a Photoshop CS6 guide book I got in college to learn CC, or is there too many differences between CS6 and CC?

I have a guide book I got in college to help me learn Photoshop CS6, but I never finished the class. My question is: Can I use this book to learn Photoshop CC or is there too much diversity between CS6 and CC?

caj50932876 wrote:
Thanks! I appreciate you answering so quickly!
That's OK. We race to be the first responder, because we are sad geeks, and first responder sounds like something from a TV reality program. Benjamin actually has flashing lights and a siren on his computer.

Too many wireless-g networks in my neighborhood - connectivity issues???

I have a WRT54G (V.2) wireless router with the latest firmware and a couple of PC (XP) on a wireless-G network. I can see a variety of other wireless-g networks in my neighborhood all within signal range. Any where from 8-10 of them...
I have changed channels so that I am not on or near most of the other networks, but with that many it is impossible to find a unique channel and I know they overlap some what.
I seem to have on and off connectivity issues with a PC about 30-40' away in another room. It works for 5 or so minutes and then disconnects, reconnects to the wireless network and it works again for a little bit.
No changes have been made to the equipment over the last year. All I can contribute it to is the additional wireless networks within range now.
Anyone have any suggestions on what I can do to better the connectivity? I see Wireless-N(draft) out, but from all the reviews it does seem to work any better than wireless-g.
What about the db 7 gain antenna over the db 5 the adapters come with?

Thanks for the input. The network SSID is unique and I am running WPA encryption. I cannot say what kind of phone systems the neighbors has, but my wireless phone system is at 5.8 Ghz.
The PC does not switch to other systems, just losses connection, then you right click and select repair and it reconnects. Sometimes it reconnects by itself if you are patient enough to wait for it...

Do I have too many wifi networks

I could use some other opinions on my setup as as I'm just not sure I've gone about this the right way over time. I don't know if all these signals are creating conflicts or anything.
For all referenced wifi/wireless signals, I have not limited to a particular channel or signal.
Through the past few years I've tried to maximize our wifi signal such that we have good coverage inside the house and outside while sitting on the front and back porch. Our house is 4 levels including a basement and top floor with 6,000 square feet or so. With kids/parents, etc, we have an apple tv connecting wirelessly, two iphones, we control our outdoor speakers wirelessly, one macbook, multiple ipads/iphones, etc. The set up I have today is:
Verizon ran the FiOs stuff through the basement so their wire/router comes in on the bottom/basement floor. I've taken their Verizon router and turned off the wifi, and connect their router directly to an Apple time capsule. I have a wireless signal turned on here to cover the basement. All Ethernet connections in the house are to this TC in the basement.
Note all references to wireless networks are a wireless network by the same name but "created" with the same password (not extending a wireless network) unless otherwise noted:
Basement:
1. The wifi signal mentioned above.
On the ground level I have:
1. Kitchen connected by Ethernet with an airport express sending a wireless signal.
2. A cubby hole office area connected by ethernet with an airport express. This sends out a wireless signal.
3. Family room has an entertainment system with an airport express with speakers connected that are wired all the way outside the house. This system sends off a wireless signal that "extends" the wireless network (not connected by Ethernet due to location).
4. Recently added a brand new Time Capsule in the main office area. This sends a wireless signal as well. This was installed in the past 72 hours and I swear it seems like the signals have gotten worse in the house.
On the third floor:
1. A loft area is connected by Ethernet with a 1st gen Time Capsule. This sends a wireless signal.
2. The master bedroom is connected by Ethernet with an airport express. This sends a wireless signal.
4th floor: No hardware. Area rarely used.
In the ground floor, # 3 was needed with how we set up our outdoor speakers. I've noticed that different devices will connect to different wifi signals even if we're sitting side by side. I'm not an expert at this stuff but I basically kept adding hardware until I could feel comfortable I was getting a solid signal with the shape/construction of our house. Not sure if there is a better way to go about it.
Thanks for reading.

In addition to John Galt's comments, here is some additional information to consider.
Mac laptops will generally do a good job of automatically switching from one wireless access point to another as they move about the house....to pick up the "best" quality signal from what is usually the closest wireless access point at any given time.
But, this is not generally true for iOS devices like an iPhone and iPad.....since these devices use much simpler operating systems than a Mac computer. As a general rule, an iOS will connect to the closest wireless access point (the strongest signal) when it is powered up.
But, if you move an iOS device from one area to another, the iOS will usually not switch access points quickly, and instead hold onto the original AirPort to which it connected....even if it is close to another access point. Kind of a nature of the beast with the iOS system.
The iOS device might switch over to another access points after some time....a few minutes or longer....and it might not. You have to experiment a bit to find out how things behave at your home.
So, if you are moving an iOS device from one side of the house to another, or from upstairs to downstairs....and you want the iOS device to connect to the best quality signal....turn off the WiFi temporarily for a minute or two on the iOS device and then turn it back on when the iOS device is in the new location. The iOS device will usually connect to the stronger wireless access point when you do this.

Netctl fails to connect to a wireless network and does not give detail

If I try to connect to a wireless network (WEP, DHCP) using netctl I get "Jon for netctl@wlp2s0\x2dnetworkname.service failed." and two commands (journalctl -xn and systemctl status ...) that should give details about the error.
However, both of them give the following lines:
oct 05 14:44:25 laptop network[422]: Starting network profile 'wlp2s0-networkname'...
oct 05 14:44:30 laptop network[422]: Failed to bring the network up for profile 'wlp2s0-networkname'
oct 05 14:44:30 laptop systemd[1]: netctl@wlp2s0\x2dnetworkname.service: main process exited, code=exited, status=1/FAILURE
oct 05 14:44:30 laptop systemd[1]: Failed to start Networking for netctl profile wlp2s0-networkname.
oct 05 14:44:30 laptop systemd[1]: Unit netctl@wlp2s0\x2dnetworkname.service entered failed state.
Just one line saying that it was trying to connect and four lines repeating the same thing (connecting failed), but it does not give any detail at all.
The netctl profile is:
Interface=wlp2s0
Connection=wireless
Security=wep
ESSID=networkname
IP=dhcp
Key=\"hex-password
Last edited by eduardosm (2014-10-05 14:01:02)

MoonSwan wrote:Either this Key=\"hex-password was a typo when you cut & pasted that code or your issue is that you need a closing " symbol. So your line should read: Key=\"hex-password".
If you look at the netctl.profile man page, it explains some special quoting rules at the end. The literal double-quote (or escaped double-quote) actually just results in a non-quoted string when passed from netctl to the underlying supporting software. This is apparently necessary if the WEP key is in hexadecimal.

Iwlist scan fails when there too many wireless networks

Similar Messages

Maybe you are looking for