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  3. Event ID: 3003 (A validation error has occurred) [Client Side ...

Event ID: 3003 (A validation error has occurred) [Client Side ...

Rsdaa 12/12/2021 213

['

Event

', '

ID:

', '

3003

', '

(A

', '

validation

', '

error

', '

has

', '

occurred)

', '

[Client

', '

Side

', '

-

', '

"Server

', '

communication

', '

error.

', '

Please

', '

refresh

', '

your

', '

browser

', '

and

', '

try

', '

again"

', '

when

', '

composing

', '

or

', '

replying

', '

to

', '

a

', '

message

', '

with

', '

HTML]

', '

SYMPTOMS

', '

When

', '

composing

', '

a

', '

new

', '

message

', '

or

', '

replying

', '

to

', '

a

', '

message

', '

the

', '

following

', '

error

', '

maybe

', '

presented

', '

within

', '

the

', '

browser:

', '

"Server

', '

communication

', '

error.

', '

Please

', '

refresh

', '

your

', '

browser

', '

and

', '

try

', '

again".

', '

Another

', '

symptom

', '

for

', '

this

', '

issue

', '

can

', '

be

', '

in

', '

the

', '

form

', '

of

', '

a

', '

server

', '

error

', '

in

', '

the

', '

server

', '

application

', '

event

', '

logs

', '

as

', '

follows:

', '

Description:

', '

Event

', '

code:

', '

3003

', '

Event

', '

message:

', '

A

', '

validation

', '

error

', '

has

', '

occurred.

', '

Along

', '

with

', '

the

', '

.NET

', '

error

', '

error

', '

information

', '

as

', '

follows:

', '

Exception

', '

information:

', '

Exception

', '

type:

', '

HttpRequestValidationException

', '

Exception

', '

message:

', '

A

', '

potentially

', '

dangerous

', '

Request.Form

', '

value

', '

was

', '

detected

', '

from

', '

the

', '

client

', '

(MsgBody="

', '

s...").

', '

CAUSE

', '

The

', '

.NET

', '

framework

', '

is

', '

displaying

', '

an

', '

error

', '

because

', '

it

', '

detected

', '

("")

', '

brackets

', '

within

', '

the

', '

message

', '

being

', '

posted

', '

back

', '

to

', '

the

', '

server.

', '

RESOLUTION

', '

MailEnable

', '

Application

', '

Pool

', '

running

', '

under

', '

the

', '

Microsoft

', '

.NET

', '

2.0

', '

Framework:

', '

To

', '

resolve

', '

the

', '

"server

', '

communication

', '

error"

', '

the

', '

ValidateRequest

', '

needs

', '

to

', '

be

', '

set

', '

to

', '

"false"so

', '

that

', '

the

', '

postback

', '

validation

', '

does

', '

not

', '

occur.

', '

To

', '

disable

', '

request

', '

validation

', '

follow

', '

the

', '

steps

', '

below:

', '

Navigate

', '

within

', '

the

', '

MailEnable

', '

installation

', '

path

', '

to

', '

the

', '

following

', '

location:

', '

Mail

', '

Enable\\BIN\\NetWebmail\\

', '

Locate

', '

the

', '

"web.config"

', '

file

', '

and

', '

open

', '

it

', '

within

', '

"Notepad".

', '

Scroll

', '

down

', '

the

', '

page

', '

and

', '

locate

', '

a

', '

line

', '

which

', '

may

', '

look

', '

like

', '

the

', '

following:

', '

', '

validateRequest="true"

', '

enableEventValidation="false"/>

', '

Change

', '

the

', '

"validateRequest"

', '

to

', '

"false"

', '

if

', '

it

', '

is

', '

not

', '

already

', '

set.

', '

Save

', '

the

', '

the

', '

file

', '

and

', '

close

', '

Notepad.

', '

Next

', '

restart

', '

IIS

', '

within

', '

a

', '

command

', '

prompt

', '

or

', '

within

', '

Windows

', '

Internet

', '

Information

', '

Services

', '

(IIS)

', '

Manager.

', '

If

', '

MailEnable

', '

web

', '

mail

', '

is

', '

running

', '

as

', '

a

', '

virtual

', '

directory

', '

and

', '

the

', '

root

', '

sites

', '

"web.config"

', '

contains

', '

the

', '

post

', '

back

', '

validation

', '

check

', '

then

', '

this

', '

will

', '

override

', '

the

', '

MailEnable

', '

web

', "

mail's

", '

virtual

', '

directory

', '

"web.config"

', '

file

', '

settings.

', '

The

', '

same

', '

procedure

', '

applies

', '

as

', '

the

', '

above

', '

steps

', '

to

', '

disable

', '

the

', '

post

', '

back

', '

validation

', '

check

', '

by

', '

locating

', '

the

', '

root

', '

websites

', '

"web.config"

', '

file

', '

and

', '

setting

', '

the

', '

validateRequest

', '

to

', '

"false".

', '

Alternately

', '

you

', '

can

', '

globally

', '

turn

', '

request

', '

validation

', '

off

', '

which

', '

maybe

', '

overriding

', '

the

', '

MailEnable

', '

"web.config"

', '

file

', '

settings.

', '

To

', '

globally

', '

turn

', '

request

', '

validation

', '

off

', '

follow

', '

the

', '

steps

', '

below:

', '

Navigate

', '

to

', '

the

', '

global

', '

.Net

', '

configuration

', '

directory

', '

for

', '

the

', '

.Net

', '

version

', '

webmail

', '

is

', '

using.

', '

For

', '

example,

', '

if

', '

using

', '

.Net

', '

2

', '

in

', '

32bit

', '

it

', '

will

', '

be

', '

Windows\\Microsoft.NET\\Framework\\v2.0.50727\\CONFIG.

', '

Locate

', '

the

', '

"web.config"

', '

file

', '

and

', '

open

', '

it

', '

within

', '

"Notepad".

', '

Either

', '

add

', '

the

', '

following

', '

line

', '

or

', '

modify

', '

an

', '

existing

', '

setting

', '

by

', '

searching

', '

for

', '

validateRequest:

', '

', '

validateRequest="false"

', '

/>

', '

The

', '

above

', '

should

', '

be

', '

within

', '

the

', '', '

section.

', '

This

', '

will

', '

turn

', '

off

', '

request

', '

validation

', '

for

', '

every

', '

page

', '

in

', '

your

', '

application.

', '

Save

', '

the

', '

the

', '

file

', '

and

', '

close

', '

Notepad.

', '

Next

', '

restart

', '

IIS

', '

within

', '

a

', '

command

', '

prompt

', '

or

', '

within

', '

Windows

', '

Internet

', '

Information

', '

Services

', '

(IIS)

', '

Manager.

', '

MailEnable

', '

Application

', '

Pool

', '

running

', '

under

', '

Microsoft

', '

.NET

', '

4.0

', '

Framework:

', '

If

', '

the

', '

MailEnable

', '

application

', '

pool

', '

is

', '

set

', '

to

', '

run

', '

under

', '

4.0

', '

then

', '

the

', '

requestValidationMode="2.0"

', '

needs

', '

to

', '

be

', '

set

', '

within

', '

the

', '

MailEnable

', '

web

', '

mail

', '

web.config.

', '

Also

', '

the

', '

"validateRequest"

', '

set

', '

to

', '

"false"

', '

also

', '

applies.

', '

', '

maxRequestLength="10240"

', '

executionTiemout="3600"

', '

requestValidationMode="2.0"

', '

/>

', '

MORE

', '

INFORMATION

', '

Third

', '

party

', '

script

', '

blockers

', '

may

', '

also

', '

throw

', '

similar

', '

exceptions

', '

and

', '

contribute

', '

to

', '

the

', '

"Server

', '

communications

', '

error".

', '

To

', '

ensure

', '

that

', '

script

', '

blockers

', '

are

', '

not

', '

the

', '

cause

', '

of

', '

the

', '

post

', '

back

', '

validation

', '

problems

', '

in

', '

web

', '

mail

', '

and

', '

causing

', '

the

', '

exceptions

', '

it

', '

is

', '

best

', '

to

', '

disable

', '

the

', '

script

', '

blocking

', '

application

', '

and

', '

test

', '

within

', '

web

', '

mail

', '

again.

', '

Product:

', '

MailEnable

', '

(Std-Any

', '

Pro-Any

', '

Ent-Any)

', '

Article:

', '

ME020512

', '

Module:

', '

WebMail

', '

Keywords:

', '

Server,communication,error,postback,validation,3003,HttpRequestValidationException

', '

Class:

', '

TRB:

', '

Troubleshooting

', '

(Configuration

', '

or

', '

Environment)

', '

Revised:

', '

Friday,

', '

October

', '

6,

', '

2017

', '

Author:

', '

MailEnable

', '

Publisher:

', '

MailEnable

']

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